How to make copy constructor in C++,with code example

In copy constructor, we copy a constructor to another object. When we have to make a constructor with same values of attributes which another constructor have, then we use copy constructor technique.

I give an example code in C++ to understand copy constructor concept.

#include<iostream>

using namespace std;

class distancee

{ private:

int feet;

float inches;

public:

                distancee( ):feet(0),inches(0.0)

                { }

                distancee(int ft,float in ):feet(ft),inches(in)

                {  }

                void getdist()

                {cin>>feet>>inches;}

                void showdist()

                {cout<<feet<<inches;}

};

int main()

{   distancee dist1(11,6.25);

     distancee dist2(dist1);

                                 distancee dist3=dist1;

                                 cout<<"\ndist1=";dist1.showdist();

                                                 cout<<"\ndist2=";dist2.showdist();

                                                 cout<<"\ndist3=";dist3.showdist();

                                                system("pause");

                                                 return 0;

}

Here:

1.     1. distancee(int ft,float in ):feet(ft),inches(in){}

      2. distancee dist1(11,6.25);

3.     3. distancee dist2(dist1);

In 1. We make a constructor of two attributes.

In 2. We pass values in constructor using object “dist1”.

 In 3. We pass just “dist1” object in constructor for copy constructor to “dist2”.