#include<iostream>

using namespace std;

class rect

{

    int l,b;

    public:

    rect(int a, int c)

    {

        l=a;

        b=c;

        cout<<l*b;

    }

};

​

int main()

{

    rect r1(1, 2); //implicit call to constructor

    cout<<endl<<endl;

    rect r2 = rect(4,5); //explicit call to constructor

}