I'm having trouble with a couple of things in my program.
I want to create 3 different players and then record their scores to a file called highScores.txt
I need to also come up with another game that features an array in it (i would put this in the place that says //ARRAY GAME WITH point values here)...this game should just like the other two games have point values.

Also, I tried creating one of the players and I get a compiling error that says:

project2.cpp:131: error: ‘x’ was not declared in this scope
project2.cpp:169: error: ‘x’ was not declared in this scope
project2.cpp:238: error: ‘x’ was not declared in this scope
project2.cpp:276: error: ‘x’ was not declared in this scope
project2.cpp:344: error: ‘x’ was not declared in this scope
project2.cpp:382: error: ‘x’ was not declared in this scope
project2.cpp:448: error: ‘x’ was not declared in this scope
project2.cpp:484: error: ‘x’ was not declared in this scope
project2.cpp:552: error: ‘x’ was not declared in this scope
project2.cpp:590: error: ‘x’ was not declared in this scope
project2.cpp:655: error: ‘x’ was not declared in this scope
project2.cpp:693: error: ‘x’ was not declared in this scope
project2.cpp: In function ‘void getPlayerInfo(Player&)’:
project2.cpp:869: error: invalid conversion from ‘void’ to ‘char
project2.cpp:869: error: cannot convert ‘double’ to ‘size_t*’ for argument ‘2’ to ‘__ssize_t getline(char
, size_t
, FILE*)’

I'm not sure how to do this and I'm very new to c++.
If anyone could help me I would appreciate it.

(sorry for the lengthyness)
This is my code:

#include <iostream> 
#include <cstdlib>
#include <fstream>
#include <string>
#include <ctime>
#include <iomanip>
using namespace std;

struct Player{
    string name;
    double score;
};


void displayMenu();
void getChoice(int & );
void displayRules();
void displayPlaceMenu();
void getPlace(int &);
void displayCharacterMenu();
void getCharacter(int & );
void displayWeaponMenu();
void getWeapon(int &);
void getPlayerInfo( Player  & );
void displayPlayerInfo( Player );
void writePlayerInfoToFile();



int main()
{

    int choice, place, person, weapon, random;
    string name;
    double score;
    char PLAY;

    Player aPlayer;
    getPlayerInfo(aPlayer);
    displayPlayerInfo(aPlayer);
do
{
    displayMenu();

    getChoice(choice);


    switch (choice)
    {  

        case 1:
            displayRules();
            break;

        case 2: 
            displayPlaceMenu();
            getPlace(place);
            displayCharacterMenu();
            getCharacter(person);
            displayWeaponMenu();
            getWeapon(weapon);

            cout <<"*_*_**_*_**_*_**_*_**_*_**_*_**_*_*"<< endl;
            cout <<"Processing your choices..." << endl;
            cout <<"You're adventure is now created..." << endl;
            cout <<"               _( )_              "<<endl;
            cout <<"        (_ O _)             "<<endl;
            cout <<"                (_)               "<<endl;
            cout <<"*_*_**_*_**_*_**_*_**_*_**_*_**_*_*"<< endl;

            //GAME WITH HUMAN AT ATLANTIS   
            if (place==1) {
            if (person==1) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;

                //ARRAY GAME HERE with POINT VALUES

                cout << "               o                            " <<endl;                  
                cout << "                              ___..                       ,   " <<endl;
                cout << "                      __..--''__ (                      .';   " <<endl;
                cout << "  o      __.-------.-'            `--..__             .'  ;   " <<endl;
                cout << "    _.--'   0)         .--._             ``--...____.'   .'   " <<endl;
                cout << "   (     _.      )).   .__.-''                          <     " <<endl;
                cout << "    `````---....._____.....-   -..___       _____...--'-.'.   " <<endl;
                cout << "                        `-.___.'     ```````             `.;  " <<endl;
                cout << "                                                           `  " <<endl;


                cout << "--------------------------------------" << endl;
                cout << "You swim to the underwater castle and find an" <<endl; 
                cout << "angry shark coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                //HUMAN WITH BOW AND ARROW OR SPEAR GAME
                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The shark is hit in the tail and swam away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The shark is hit in the fin and swims away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The shark is hit in the nose and swam away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the shark, the shark eats you...\n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{
                //HUMAN WITH MAGIC GAME
                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "A sea witch lures you into her lair and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return to a normal human." << endl;
                cout << "If not you will remain a mermaid and be trapped underwater forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }   
            //GAME WITH ORC AT ATLANTIS 


            //ARRAY GAME HERE with POINT VALUES

            if (place==1) {
            if (person==2) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;

                //ARRAY GAME HERE with POINT VALUES

                cout << "               o                            " <<endl;                  
                cout << "                              ___..                       ,   " <<endl;
                cout << "                      __..--''__ (                      .';   " <<endl;
                cout << "  o      __.-------.-'            `--..__             .'  ;   " <<endl;
                cout << "    _.--'   0)         .--._             ``--...____.'   .'   " <<endl;
                cout << "   (     _.      )).   .__.-''                          <     " <<endl;
                cout << "    `````---....._____.....-   -..___       _____...--'-.'.   " <<endl;
                cout << "                        `-.___.'     ```````             `.;  " <<endl;
                cout << "                                                           `  " <<endl;


                cout << "--------------------------------------" << endl;
                cout << "You swim to the underwater castle and find an" <<endl; 
                cout << "angry shark coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The shark is hit in the tail and swam away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The shark is hit in the fin and swims away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The shark is hit in the nose and swam away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the shark, the shark eats you...\n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{

                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;             

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "A sea witch lures you into her lair and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return to a normal human." << endl;
                cout << "If not you will remain a mermaid and be trapped underwater forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }
            //GAME WITH ELF AT ATLANTIS WITH BOW ARROW OR SPEAR

            //ARRAY GAME HERE with POINT VALUES

            if (place==1) {
            if (person==3) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;

                //ARRAY GAME HERE with POINT VALUES

                cout << "               o                            " <<endl;                  
                cout << "                              ___..                       ,   " <<endl;
                cout << "                      __..--''__ (                      .';   " <<endl;
                cout << "  o      __.-------.-'            `--..__             .'  ;   " <<endl;
                cout << "    _.--'   0)         .--._             ``--...____.'   .'   " <<endl;
                cout << "   (     _.      )).   .__.-''                          <     " <<endl;
                cout << "    `````---....._____.....-   -..___       _____...--'-.'.   " <<endl;
                cout << "                        `-.___.'     ```````             `.;  " <<endl;
                cout << "                                                           `  " <<endl;


                cout << "--------------------------------------" << endl;
                cout << "You swim to the underwater castle and find an" <<endl; 
                cout << "angry shark coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The shark is hit in the tail and swam away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The shark is hit in the fin and swims away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The shark is hit in the nose and swam away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the shark, the shark eats you...\n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{

                cout << "Now traveling to Atlantis..." << endl;
                cout << "You can now breathe underwater." << endl;

                cout << "            o         " << endl;
                    cout <<   "       o            " << endl;
                cout << "         O                  " << endl;
                cout << "        ~|~               " << endl;
                cout << "         }{                 " << endl;

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "A sea witch lures you into her lair and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return to a normal human." << endl;
                cout << "If not you will remain a mermaid and be trapped underwater forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }       

            //GAME WITH HUMAN AT PARADISE ISLAND    
            if (place==2) {
            if (person==1) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;


                //ARRAY GAME HERE with POINT VALUES

                cout << "                      _  _                       "<< endl; 
                cout << "    _ _      (0)(0)-._  _.-'^^'^^'^^'^^'^^'--.           "<< endl;
                cout << "   (.(.)----'`        ^^'                /^   ^^-.       "<< endl;
                cout << "   (    `                 |             |    _    ^^-.       "<< endl;
                cout << "    VvvvvvvVv~~`__,-.._>  |:|:|:|:|:|:|:|  (_..,______^^-.   "<< endl;
                cout << "     `^^^^^^^^`/  /   /  /`^^^^^^^^^>^^>^`>  >        _`)  ) "<< endl;
                cout << "              (((`   (((`          (((`  (((`        `'--'^  "<< endl;

                cout << "--------------------------------------" << endl;
                cout << "You walk over to a nearby tree and find an" <<endl; 
                cout << "angry gator coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                //HUMAN WITH BOW AND ARROW OR SPEAR GAME
                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The gator is hit in the tail and runs away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The gator is hit in the body and runs away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The gator is hit in the head and runs away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the gator, the gator eats you... \n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << score << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{
                //HUMAN WITH MAGIC GAME

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "An islander lures you into her cave and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return home." << endl;
                cout << "If not you will remain on this  island forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }   
            //GAME WITH ORC AT PARADISE ISLAND 


            //ARRAY GAME HERE with POINT VALUES

            if (place==2) {
            if (person==2) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;


                //ARRAY GAME HERE with POINT VALUES

                cout << "                      _  _                       "<< endl; 
                cout << "    _ _      (0)(0)-._  _.-'^^'^^'^^'^^'^^'--.           "<< endl;
                cout << "   (.(.)----'`        ^^'                /^   ^^-.       "<< endl;
                cout << "   (    `                 |             |    _    ^^-.       "<< endl;
                cout << "    VvvvvvvVv~~`__,-.._>  |:|:|:|:|:|:|:|  (_..,______^^-.   "<< endl;
                cout << "     `^^^^^^^^`/  /   /  /`^^^^^^^^^>^^>^`>  >        _`)  ) "<< endl;
                cout << "              (((`   (((`          (((`  (((`        `'--'^  "<< endl;


                cout << "--------------------------------------" << endl;
                cout << "You walk over to a nearby tree and find an" <<endl; 
                cout << "angry gator coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                //ORC WITH BOW AND ARROW OR SPEAR GAME
                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The gator is hit in the tail and runs away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The gator is hit in the body and runs away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The gator is hit in the head and runs away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the gator, the gator eats you... \n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{
                //ORC WITH MAGIC GAME

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "An islander lures you into her cave and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return home." << endl;
                cout << "If not you will remain on this  island forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }       
            //GAME WITH ELF AT PARADISE ISLAND

            if (place==2) {
            if (person==3) {
            if (weapon==1 || weapon ==2) {  

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;


                //ARRAY GAME HERE with POINT VALUES

                cout << "                      _  _                       "<< endl; 
                cout << "    _ _      (0)(0)-._  _.-'^^'^^'^^'^^'^^'--.           "<< endl;
                cout << "   (.(.)----'`        ^^'                /^   ^^-.       "<< endl;
                cout << "   (    `                 |             |    _    ^^-.       "<< endl;
                cout << "    VvvvvvvVv~~`__,-.._>  |:|:|:|:|:|:|:|  (_..,______^^-.   "<< endl;
                cout << "     `^^^^^^^^`/  /   /  /`^^^^^^^^^>^^>^`>  >        _`)  ) "<< endl;
                cout << "              (((`   (((`          (((`  (((`        `'--'^  "<< endl;


                cout << "--------------------------------------" << endl;
                cout << "You walk over to a nearby tree and find an" <<endl; 
                cout << "angry gator coming towards you." <<endl;
                    cout << "It's time for you to use your weapon and find out your skill... "<<endl;
                cout << "~~***~~***~~***~~~***~~~***~~~***~~~***~~~~****~~~~~~***~~~~***~~"<<endl;
                cout << "Now generating random fate with weapon..."<<endl;
                cout << "Processing..." << endl;

                //ELF WITH BOW AND ARROW OR SPEAR GAME
                    srand(time(NULL));
                    random = rand() % 4 + 1;
                    cout << "Your number is " << random << endl;
                    cout << "That means that...\n" << endl;

                    switch(random) {
                        case 1: random = 100;
                            cout << "Good job! The gator is hit in the tail and runs away...\n" << endl;
                            break;
                        case 2: random = 200;
                            cout << "Good job! The gator is hit in the body and runs away...\n" << endl;
                            break;
                        case 3: random = 300;
                            cout << "Good job! The gator is hit in the head and runs away...\n" << endl;
                            break;
                        default: random = 0;
                            cout << "Too bad. No target is hit...\n" << endl;
                        cout << "Since you didn't defeat the gator, the gator eats you... \n" << endl;
                    }
                        score=random+100;
                        cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                        cout << "Please enter your name: " << endl;
                        getline(cin, x.name);
                    getPlayerInfo(aPlayer);
                    displayPlayerInfo(aPlayer);
                    writePlayerInfoToFile();
                }
                else{
                //ELF WITH MAGIC GAME

                cout << "Now traveling to Paradise Island..." << endl;
                cout << "You arrive to a remote island." << endl;

                cout << " _//_                " <<endl;
                cout << " /o\\    o/           " <<endl;
                cout << "  |    /|            " <<endl;
                cout << " _|___ /_|_________  " <<endl;

                srand(time(NULL));
                    random = rand() % 2 + 1;
                    cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::." << endl;
                cout << "An islander lures you into her cave and teaches you" << endl;
                    cout << "how to make potions. If you are succesful you will return home." << endl;
                cout << "If not you will remain on this  island forever."<<endl;
                    cout << "It's time to test your potion making skills! \n" << endl;
                    cout << "Now we will determine whether or not your potion is a success or failure...:"<<endl;
                cout << ".::**::..::**::..::**::..::**::..::**::...::**::...::**::...::**::...::**::...::**::.\n" << endl;
                cout << "Processing....."<<endl;

                    switch(random) {
                    case 1: random = -100;
                        cout << "Sorry, your potion is a failure...\n" << endl;
                        break;
                    default: random = 200;
                        cout << "Your potion is a success! \n" << endl;
                }

                    score = random + 100;
                    cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;
                    cout << "Please enter your name: " << endl;
                    getline(cin, x.name);
                getPlayerInfo(aPlayer);
                displayPlayerInfo(aPlayer);
                writePlayerInfoToFile();
                }
        }

    }   

            break;

        case 3:
            cout << "Goodbye! Thank you for playing... :D" << endl;
            cout << "--------------------------------------" << endl;
            exit(EXIT_SUCCESS);
            break;

        default:
            while(choice < 1 || choice > 3) {
            cout << "Invalid choice. Choose again...\n" << endl;
            cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
            cout << "What is your choice?" << endl;
            cin >> choice;
            break;
            }
        }


    cout << "Would you like to continue playing? (Please say Y for yes N for no): " << endl;
    cin >> PLAY;

}
 while(PLAY == 'Y' || PLAY == 'y');


 return 0;

}

void displayMenu()
{

    cout <<"               _( )_             "<<endl;
    cout <<"  _     (_ O _)            "<<endl;
    cout <<"      _( )_     (_)              "<<endl;
    cout <<"     (_ O _)  WELCOME  TO        "<<endl;
    cout <<"       (_)  FANTASY LAND!        "<<endl;
    cout <<"        _( )_       ()__         "<<endl;
    cout <<"       (_ O _)     :=)___)-.     "<<endl;
    cout <<"         (_)        ()     |     "<<endl;
    cout <<"                           |     "<<endl;
    cout <<"                           |     "<<endl;
    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
    cout << "Hello Gamer! Please pick your choice from the main menu! \n" << endl;
    cout << "         ~Main Menu~" << endl;
    cout << "-------------------------------" << endl;
    cout << "|        1. See Rules         |" << endl;
    cout << "|        2. Play game         |" << endl;
    cout << "|        3. Quit              |" << endl;
    cout << "-------------------------------" << endl;

}

void getChoice(int & choice) 
{

    cout << "What is your choice?" << endl;
    cin >> choice;
    while (choice < 1 || choice > 3) {
        cout <<"Invalid choice. It must be between 1-3."<<endl;
        cout <<"please enter your choice: 1-3"<<endl;
        cin >> choice;
    }
}

void displayRules()
{

    cout << "                   ~Rules of the Game~                     "   << endl;
    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
    cout << "This game determines your ability to hit a target" << endl;    
    cout << "depending on your character's ability. Then totals"<< endl;
    cout << "your score to see where you place on the high score chart." << endl;
    cout << "If your score is higher than then the score recorded in the" <<endl;
    cout <<   "charts you will replace them and become our new champion!"<<endl;
    cout << "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" << endl;
    cout <<"                            _( )_             "<<endl;
    cout <<"                     (_ O _)            "<<endl;
    cout <<"                             (_)              "<<endl;

}
void displayPlaceMenu()
{

    cout << "--------------------------------------" << endl;
    cout << "Let's begin..." << endl;
    cout << "Where would you like to journey to...\n" << endl;
    cout << "   ~Destination Menu~" << endl;
    cout << "-------------------------------" << endl;
    cout << "|    1. Atlantis              |" << endl;
    cout << "|    2. Paradise Island       |" << endl;
    cout << "-------------------------------" << endl;

}
void getPlace(int & place) 
{

    cout << "What is your destination choice?: " << endl;
    cin >> place;
    while(place < 1 || place > 2) {
            cout << "Please enter 1 for Atlantis or 2 for Paradise Island: ";
            cin >> place;
    }
}

void displayCharacterMenu()
{

    cout << "--------------------------------------" << endl;
    cout << "Nice choice. Let's continue..." << endl;
    cout << "Choose your character...\n" << endl;
    cout << "   ~Character Menu~" << endl;
    cout << "-------------------------------" << endl;
    cout << "|    1. Human                 |" << endl;
    cout << "|    2. Orc                   |" << endl;
    cout << "|    3. Elf                   |" << endl;
    cout << "-------------------------------" << endl;

}
void getCharacter(int & person) 
{

    cout << "What is your character choice?: " << endl;
    cin >> person;
    while(person < 1 || person > 3) {
            cout << "Please enter 1 for human, 2 for orc, or 3 for elf: ";
            cin >> person;
    }
}
void displayWeaponMenu()
{

    cout << "--------------------------------------" << endl;
    cout << "Good choice. Now choose your weapon...\n" << endl;
    cout << "   ~Weapon Menu~" << endl;
    cout << "-------------------------------" << endl;
    cout << "|    1. Spear                 |" << endl;
    cout << "|    2. Bow and Arrow         |" << endl;
    cout << "|    3. Magic Staff           |" << endl;
    cout << "-------------------------------" << endl;

}
void getWeapon(int & weapon) 
{

    cout << "Which one would you like to choose? : " << endl;
    cin >> weapon;
    while(weapon < 1 || weapon > 3) {
        cout << "Please enter 1 for Spear, 2 for Bow and Arrow, or 3 for Magic Staff: ";
            cin >> weapon;
    }
}
void getPlayerInfo(Player & x)
{
    ifstream input;
    input.open("highScores.txt");
    if ( ! input ) {
        cout <<"error: cannot open file for reading."<<endl;
        cout <<"terminating the program ... "<<endl;
        exit(EXIT_FAILURE);
    }

    getline(input, x.name);

    getline(input, x.score);
    input.ignore(INT_MAX, '\n'); 

    input.close();
}
void writePlayerInfoToFile() 
{
    // open a file for writing
    ofstream output;
    output.open("highScores.txt");
    if ( ! output ) {
        cout <<"cannot open carInfo.txt for writing."<<endl;
        cout <<"terminating the program ... "<<endl;
        exit(EXIT_FAILURE);
    }
    string name;
    double score;

    cout <<"what is your name: "<<endl;
    getline(cin, name);
    output << name <<endl;

    cout << score <<endl;
    cin.ignore(INT_MAX, '\n');
    output << score <<endl;

    output.close();
}
void displayPlayerInfo( Player x ) 
{
    cout << endl;
    cout <<"Name: " << x.name << endl;
    cout <<"Score: " << x.score << endl;
    cout << endl;
}

This is the line with your first error

cout << "Congrats! Your score is: \n" << getline(cin, x.score) << endl;

Right now you are trying to use getline to display a value which will not work. You are also getting the error about x not being declered here. x should be aPlayer. It should look like this

cout << "Congrats! Your score is: \n" << aPlayer.score << endl;

All of the other refferences to x errors you are getting are the same thing.

You are also taking in score the wrong way. You have score declared as a double but you are using getline() which is for strings. You can get the info from the file with getline if you store it in a string and then you can convert that string to a number to populate score.

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