// Description: This program allows the user to enter five numbers, like a lottery.
// The program chooses five numbers at random and compares them to see if the user won.
// Inputs: numbers
// Outputs: random numbers, prize message, user numbers
// Programmer Name: David Pfaff
// Username: dpfaff
// Date: April 9, 2008
 
#include <iostream>
#include <iomanip>
#include <ctime>
#include <cstdlib>
using namespace std;
 
const int MAXCHARS = 5;
 
// prints a number of new lines
// inputs: num, the number of new lines desired
// outputs: num newlines on the screen
// usage: printNewLines(4);
void printNewLines(int num);
 
// displays the programmer name and description
// outputs: the programmer name and description of program
// usage: displayInfo();
void displayInfo();
 
// allows the user to select five numbers to play the lottery.
// inputs: five numbers
// outputs: none
// usage: getTicket (int user[])
void getTicket (int user[]);
 
// the computer selects five random numbers for the lottery
// inputs: none
// outputs: five random numbers
// usage: getLottery(int lottery[])
void getLottery(int lottery[]);
 
// compares the user input and the computer's output
// inputs: none
// outputs: number of pairs
// usage: int compare(user, lottery)
int compare(int user[], int lottery[]);
 
// tells the user which prize package he/she has won if there were any matching pairs
// inputs: none
// outputs: prize package
// usage: displayPrize(user)
void displayPrize(int correct);
 
// receives an answer from user as to whether he/she would like to continue playing
// inputs: answer
// ouputs: repeat of program
// usage: toContinue(answer)
void toContinue(char& answer);
 
int main()
{
    int user[MAXCHARS];
    int lottery[MAXCHARS];
    int correct, compareNumbers;
    char answer;
 
    do
    {
        printNewLines(2);
        displayInfo();
        printNewLines(2);
 
        getTicket(user);
        printNewLines(2);
 
        getLottery(lottery);
        printNewLines(2);
 
        correct = compareNumbers[user, lottery];
        printNewLines(2);
 
        displayPrize(correct);
        printNewLines(2);
 
        toContinue(answer);
        printNewLines(2);
    }while(answer == 'y' || answer == 'Y');
}  
 
 
// prints a number of new lines
// inputs: num, the number of new lines desired
// outputs: num newlines on the screen
// usage: printNewLines(4);
void printNewLines(int num)
{
    for (int i = 0; i < num; i++)
        cout << endl;
} 
 
// displays the programmer name and description
// outputs: the programmer name and description of program
// usage: displayInfo();
void displayInfo()
{
    cout << "David Pfaff";
    printNewLines(2);
    cout << "Description: This program allows the user to enter five numbers, like a lottery.";
    cout << "The program chooses 5 numbers at random and compares them to see if the user won.";
}
 
// allows the user to select five numbers to play the lottery.
// inputs: five numbers
// outputs: none
// usage: getTicket (int user[])
void getTicket (int user[])
{
    cout << "Enter a single digit number (0 through 9).";
    printNewLines(2);
 
    for(int i = 0; i < MAXCHARS; i++)
    {
        cout << "Enter number --> ";
        cin >> user[i];
 
        if(user[i] < 0 || user [i] > 9)
        {
            cout << "Please enter another number, your entry was invalid.";
            printNewLines(2);
            cout << "Enter a number -> ";
            cin >> user[i];
            printNewLines(2);
        }   
    }
 }
 
// the computer selects five random numbers for the lottery
// inputs: none
// outputs: five random numbers
// usage: getLottery(int lottery[])
void getLottery(int lottery[])
{  
    for (int num = 0; num < MAXCHARS; num++)
        lottery[num] = rand() % 9;
}   
 
// compares the user input and the computer's output
// inputs: none
// outputs: number of pairs
// usage: int compare(user, lottery)
int compare (int user[], int lottery[])
{
    int numberCorrect = 0;
    int index = 0;
    while (index < MAXCHARS)
    {
        if(lottery[index] == user[index])
            numberCorrect++;
    }
    return numberCorrect;
}   
 
// displays the random numbers and the user's numbers
// inputs: none
// outputs: random numbers, user numbers
// usage: displayNumbers(lottery, user)
void displayNumbers(int lottery[], int user[])
{
    cout << "Lottery numbers are -> ";
    for(int count = 0; count < MAXCHARS; count++)
      cout << lottery[count];
 
    cout << "User numbers are -> ";
    for(int i = 0; i < MAXCHARS; i++)
      cout << user[i];
} 
 
// tells the user which prize package he/she has won if there were any matching pairs
// inputs: none
// outputs: prize package
// usage: displayPrize(user)
void displayPrize(int correct)
{
    switch(correct)
    {
        case 0: cout << "You did not match any numbers, please play again." << endl;
            break;
        case 1: cout << "You only matched one number, that is not enough to win." << endl;
            break;
        case 2: cout << "You matched 2 numbers, you win $100." << endl;
            break;
        case 3: cout << "You matched 3 numbers, you win $1000." << endl;
            break;
        case 4: cout << "You matched 4 numbers, you win $100,000." << endl;
            break;
        case 5: cout << "You matched all the numbers, you win $2,000,000." << endl;
            break;
    }
}
// receives an answer from user as to whether he/she would like to continue playing
// inputs: answer
// ouputs: repeat of program
// usage: toContinue(answer)
void toContinue(char& answer)
{
    cout << "Would you like to play again? If so," << endl;
    cout << "please enter a 'y' for yes and an 'n' for no." << endl;
    cout << "Press enter after answering.";
    printNewLines(2);
    cin >> answer;
}