C++ program to overload binary plus (+) to add two objects of the class by friend function

//class Distance with m and cm as members

#include <iostream>
using namespace std;
class Distance
{
    int m,cm;
    public:
        void read()
        {
            cout<<"Enter m and cm: ";
            cin>>m>>cm;
        }
        void display()
        {
            cout<<m<<"m "<<cm<<"cm"<<endl;
        }
        friend Distance operator+(Distance d1,Distance d2) //friend function
        {
            Distance dist;
            dist.m=d1.m+d2.m;
            dist.cm=d1.cm+d2.cm;
            if(dist.cm>=100)
            {
                dist.cm-=100;
                dist.m++;
            }
            return dist;
        }
};
int main()
{
    Distance d1,d2,d3;
    d1.read();
    d2.read();
    d3=d1+d2; //same as operator+(d1,d2);
    d1.display();
    d2.display();
    d3.display();
    return 0;
}