Programa:       Unidad3Ejercicio19.cpp
Descripción:    Lee un número entero y nos calcula el número de dígitos
#include <iostream>
using namespace std;
void main ()
        int n, numDigitos = 0;

        cout << "Introduzca un numero ";
        cin >> n;

        while(n != 0)
                n  /= 10;

        cout << "El numero de digitos es = " << numDigitos;


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