Copy constructor in c++.

programs of Copy constructor :

#include<iostream>
#include<stdlib.h>
using namespace std;
class abc{
 int a;
 public:
 abc(){}
 void set_a(){
  a=10;
 }
 abc(abc &obj){   // pass the object references 
  a=obj.a; 
 }
 int get_a(){   // return the veriable
  return a;
 }
};
int main(){
 abc st;
 st.set_a();
 abc std(st); 
 cout<<std.get_a();
 
}

out put:

 10

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