C++ program to use 'this' pointer

//C++ program to use 'this' pointer to return an object of a class from a member function of the class

#include <iostream>
using namespace std;
class Distance
{
    int m,cm;
    public:
        void getDistance();
        Distance addDistance(Distance);
        void displaysum();
};
void Distance::getDistance()
{
    cout<<"Enter m and cm: ";
    cin>>m>>cm;
}
Distance Distance::addDistance(Distance d2)
{
    cm=cm+d2.cm;
    if(cm>=100)
    {
        cm=cm-100;
        m=m+d2.m+1;
    }
    else
    {
        m=m+d2.m;
    }
    return *this;
}
void Distance::displaysum()
{
    cout<<"The sum is "<<m<<"m "<<cm<<"cm";
}
int main()
{
    Distance d1,d2,d3;
    d1.getDistance();
    d2.getDistance();
    d3=d1.addDistance(d2);
    d3.displaysum();
    return 0;
}