C++ program to pass OBJECT as argument and return OBJECT

//class Distance with meter and cm as private data members
//read two Objects of the class
//add them by passing these two objects to a function member
//return the result
//finally display result object in main() function

#include <iostream>
using namespace std;
class Distance
{
    int meter,cm;
    public:
        void read();
        Distance add(Distance);
        void display();
};
void Distance::read()
{
    cout<<"Enter meter and cm: ";
    cin>>meter>>cm;
}
Distance Distance::add(Distance d2)
{
    Distance sum;
    sum.cm=cm+d2.cm;
    if(sum.cm>=100)
    {
        sum.cm=sum.cm-100;
        sum.meter=1;
    }
    sum.meter=sum.meter+meter+d2.meter;
    return sum;
}
void Distance::display()
{
    cout<<"The sum is "<<meter<<" meter "<<cm<<" cm";
}
int main()
{
    Distance d1,d2,d3;
    d1.read();
    d2.read();
    d3=d1.add(d2);
    d3.display();
    return 0;
}