Objects as function arguments

Like any other data type, an object may be passed as a function argument. It can be done in two ways

1. a copy of an entire object is passed to the function.
2. only the address of the object passed to the function.

class time
{
         private: int hours, minutes;
         public:
         void sum (time, time); //function declaration taking argument of
}; 

class type
void sum (time t1, time t2)
{ }

let us consider an example:

#include<iostream.h>
class time
{
         int hour;
         int minutes;
         public:
         time() { }
         time(int h, int m)
        {
                  hour=h;
                  minutes=m;
         }
         void display()
         { cout<< hours<< “hours”;
            cout<<minutes<<“minutes”<<"\n";
}
void sum(time, time);
};
void time:: sum(time t1,time t2)
{
         minutes= t1.minutes+t2.minutes;
         hour= minutes/60;
         minutes =minutes%60;
         hour= hour + t1.hour + t2.hour;
}
void main()
{
time t1(2,40);
time t2(3,35);
time t3;
t3.sum(t1,t2);
t1.display();
t2.display();
t3.display();
}

Sample Output: