Program to illustrate sending & receiving values between Function

      #include<iostream.h>
      #include<conio.h>
    int calculate_sum(int x, int y)
    {
        int  z ;
              z = x + y ;
           return (z) ;
    }

       void main( )
       {
        int a, b, sum ;
        cout <<"\n Enter Two Number : ";
        cin >> a;
        cin >> b;

        sum = calculate_sum(a,b);
        cout<<"\n Sum is : "<<sum;
        getch();
    }