add.cpp

#include
#include

class gobi
{

public:
int a,b,c;
void add();
void display();
};
int main()
{
gobi g;
g.add();
g.display();
getch();
return 0;
}
void gobi::add()
{
clrscr();
cout<<"enter the value of a\n";
cin>>a;
cout<<"enter the value of b\n";
cin>>b;
c=a+b;
}
void gobi::display()
{
cout<<"the value of c"<< c;
}

output:

enter the value of a

2

enter the value of b

4

the value of c 6