#include<iostream>
using namespace std;
class AreaFinder
{
    float l, b, h;
    float result;
    public:
    AreaFinder(float hh = 0, float ll = 0, float bb = 0)
    {
        l = ll;
        b = bb;
        h = hh;
    }
    void Display(int ll)
    {
        if(l = 0)
            result = 3.14f * h * h;
        else
            result = l * b;
        cout<< result;
    }
};
int main()
{
    AreaFinder objAF(10, 10, 20);
    objAF.Display(0);
    return 0;
}

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