class/functions Help

I'm mainly trying to figure how to understand and implement classes/functions. I'm trying to create a program where the user enters yes or no, if there is a disc or a manual in a game case. Im just doing it as a starter program. Please dont flame, thank you!

Code:

#include stdlib.h
#include iostream.h
using namespace std;

 

int main()
{
    char Gamecheck;
    cout << "Is there a disc?" << endl;
 cin >> DiscCheck >> endl;

void Gamecheck::CheckDisc(int DiscCheck);
{ // check for cd
     if (DiscCheck == "yes")
     {
     // make a statement for cd missing
     }
     else
     {
     // remaining statement
     }
     }
     
    cin.get();
}