#include <iostream>
using namespace std;

class Area
{
public:
    float area(float r)
    {
        return 3.14 * r * r;
    }

    int area(int l, int b)
    {
        return l * b;
    }

    float area(float b, float h, int t)
    {
        return 0.5 * b * h;
    }
};

int add(int a, int b)
{
    return a + b;
}

int add(int a, int b, int c)
{
    return a + b + c;
}

double add(double a, double b)
{
    return a + b;
}

int main()
{
    Area a;
    float r, base, height;
    int l, b;

    cout << "Enter radius of circle: ";
    cin >> r;
    cout << "Area of circle = " << a.area(r) << endl;

    cout << "Enter length and breadth of rectangle: ";
    cin >> l >> b;
    cout << "Area of rectangle = " << a.area(l, b) << endl;

    cout << "Enter base and height of triangle: ";
    cin >> base >> height;
    cout << "Area of triangle = " << a.area(base, height, 1) << endl;

    cout << "\nadd(2, 3) = " << add(2, 3) << endl;
    cout << "add(2, 3, 4) = " << add(2, 3, 4) << endl;
    cout << "add(2.5, 3.7) = " << add(2.5, 3.7) << endl;

    return 0;
}