Constructor [ C++ ]

#include<iostream>
using namespace std;
class rect
{
 private:
 int area;
 public:
 rect()
{
 area=0;
}
rect(int a,int b){
area=a*b;
}
rect(rect &r)
{
area=r.area;
}
void display()
{
   cout<<"The area is:"<<area<<endl;
}
};
int main()
{
 rect r1;
 rect r2(2,6);
 rect r3(r2);
 r1.display();
 r2.display();
 r3.display();

   return 0;
}

     

           

Note: Need to be arranged in compiler after copied

   

 OutPut:

The area is:0
The area is:12
The area is:12