I have the following code but every time I go to compile it i get the same 3 errors and do not know why I am getting them. I have tried googling why but can't really understand any explanations that I am given and therefore cannot fix the errors. Any help understand why I am receiving these errors and what I need to do to fix them will be greatly appreciated. The errors are as followed:
1>orderset.obj : error LNK2005: "struct List * Head" (?Head@@3PAUList@@A) already defined in main.obj
1>orderset.obj : error LNK2005: "struct List * Last" (?Last@@3PAUList@@A) already defined in main.obj
1>C:\Users\Mike\Desktop\Mike.Stuff\School\c++\c++ spring cs2\pro2\Debug\pro2.exe : fatal error LNK1169: one or more multiply defined symbols foundCode Below:
orderset.h
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
const int SUCCESS = 0;
//===================================================================
struct List{
int data;
List *next;
}; // end of struct
List *Head, *Last;
//===================================================================
class OrderSet{
public:
OrderSet();
OrderSet(OrderSet &data);
~OrderSet();
// Member functions
OrderSet union1();
OrderSet intersection();
OrderSet find();
OrderSet add();
OrderSet test();
OrderSet getADTA();
OrderSet getADTB();
OrderSet showADTA();
OrderSet showADTB();
void mainMenu();
private:
List a;
List b;
}; // end of class
********************************
main.cpp
#include "orderset.h"
int main()
{
OrderSet o;
o.mainMenu();
return SUCCESS;
} // end of main
******************************
orderset.cpp
#include "orderset.h"
OrderSet::OrderSet()
{
} // end of constructor
//===============================
OrderSet::~OrderSet() // header the builds the de-constructor for the class
{
} // end of de-contructor
//=================================
void OrderSet::mainMenu(){
int option = 0;
OrderSet m;
cout << "Please select an option to execute by entering the number." << endl << endl;
cout << "[1] Union of sets A and B\n";
cout << "[2] Intersections of sets A and B\n";
cout << "[3] Find an element X in set A\n";
cout << "[4] Add an element X to A\n";
cout << "[5] Determine whether A < B\n";
cout << "[6] Terminate\n\n";
cout << "Enter your option now: ";
cin >> option;
if( option < 1 || option > 6 ){
cout << "\nError, option selected is not valid, please try again!." << endl << endl;
return;
} // end of if
if( option == 1 ){
cout << "\nYou selected option 1; to union the sets of list A and B." << endl << endl;
m.mainMenu();
} // end of if
if( option == 2 ){
cout << "\nYou have selected option 2; to intersect the sets of A and B." << endl << endl;
m.mainMenu();
} // end of if
if( option == 3 ){
cout << "\nYou have selected option 3; to find an element X in list A." << endl << endl;
m.mainMenu();
} // end of if
if( option == 4 ){
cout << "\nYou have selected option 4; to add a new element X to list A." << endl << endl;
m.mainMenu();
} // end of if
if( option == 5 ){
cout << "\nYou have selected option 5; to see if list A < list B." << endl << endl;
m.mainMenu();
} // end of if
if( option == 6 ){
cout << "\nYou have selected option 6; to terminate the progam.\n";
cout << "Thank you for for using our program, have a nice day =]!" << endl << endl;
return;
} // end of if
} // end of function mainMenu
//==========================