/*
 * simple example of functions -- user-written factorial, library square root
 */
#include <stdio.h>
#include <math.h>

int fact(int n);

int main(void) {

	int a;
	printf("enter an int\n");
	if (scanf("%d", &a) != 1) {
		printf("not an int\n");
        return 1;
	}

	printf("factorial(%d) = %d\n", a, fact(a));

	printf("sqrt(%d) %f\n", a, sqrt((double) a));

	return 0;
}

int fact(int n) {
	if (n <= 0) return 1;
	else return n*fact(n-1);
}