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Programa:       Ejercicio3.cpp
Fecha:          11/10/2007
Descripción:    Calcula el area de una circulo
#include <iostream>
using namespace std;
void main()
        const float PI=3.1416;
        float r,a;
        // Leemos el valor del radio
        cout << "introduzca el valor del radio ";
        cin >> r;
        // Calculamos el area
        a = PI * (r * r);
        // Mostramos resultado
        cout << "El area es = " << a;

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