void exponencial(int *a, int k,double *exp) {
	int *cont = new int;
	*cont = 0; double *expaux = new double; *expaux = 0.0;
	int*factor = new int; int numero; double termino;
	for (int i = 0; i < k; i++)
	{
		factorial(cont, factor);
		numero = pow(*a, *cont);
		termino = numero / *factor;
		*expaux += termino;
		*cont++;
	}
	*exp = *expaux;
}