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To implement Copy Constructor in C++

#include<iostream.h>
#include<conio.h>

 class myclass
 { private:
   int a;
   public:
   myclass(int a1)
   { a=a1;
     cout<<"\n\n  This is previous value:  "<<a;
   }
   myclass(myclass &obj)
   { a=obj.a;
     cout<<"\n\n  This is copied value: "<<a;
   }
 };

 void main()
 { clrscr();
   myclass m1(333);
   myclass m2(m1);
   getch();
 }

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