/*  Fun‡”es - Introdu‡„o.
		C lculo combinat˘rio - IV.
		PP, 96.12
		PP, 97.5																		 */

#include <stdio.h>
#include <stdlib.h>

long int fact (long int);

int main(int na, char *v[])
{   long int n, p;

	printf("C lculo de Combina‡”es de n p a p\n");
	if (na!=3)
	{	printf("combnpp <n> <p>\n");
		return(-1);
	}

	printf("Valor de n :%li\n", n = atoi(v[1]));
	printf("Valor de p :%li\n", p = atoi(v[2]));

	printf("Combina‡”es de %ld %ld a %ld = %d\n", n, p, p, fact(n)/(fact(p)*fact(n-p)));

}

long int fact(long int n)
{	long int nf;

	if (n!=1)
	{	nf = n*fact(n-1);
		return(nf);
	}
	else
		return(1);
}