#include <math.h>

int main (void) {
   double x;
   printf ("enter x: ");
   scanf ("%lf", &x);
   printf ("the absolute value is %f\n", fabs(x));
   printf ("the square root is %f\n", sqrt(x));
   printf ("the value of x^4 is %f\n%", pow(x, 4.0));

}