Friend Function an Example

#include
class exforsys
{
private:
int a,b;
public:
void test()
{
a=100;
b=200;
}
friend int compute(exforsys e1)

//Friend Function Declaration with keyword friend and with the object of class exforsys to which it is friend passed to it
};

int compute(exforsys e1)
{
//Friend Function Definition which has access to private data
return int(e1.a+e2.b)-5;
}

main()
{
exforsys e;
e.test();
cout<<"The result is:"<
//Calling of Friend Function with object as argument.
}