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

/* Compute 4th root */
float fourthroot(float x) {
    if (x < 0) {
	printf("fourthroot: negative!\n");
	exit(0);
    }
    return sqrt(sqrt(x));
}

/* Test program */
int main() {
    float n;
    printf("Enter n: ");
    scanf("%g", &n);
    printf("Result: %g\n",
	   fourthroot(n));
    return 0;
}