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

/**
 * root N - compute the square root of N.
 */
int
main (int argc, char *argv[])
{
  double d;

  // Check the number of parameters
  if (argc != 2)
    {
      printf ("Usage: sqrt NUM\n");
      return EXIT_FAILURE;
    }

  // Parse the parameter
  d = atof (argv[1]);

  // And print out the result
  printf ("sqrt(%lf) = %lf\n", d, sqrt(d));

  return EXIT_SUCCESS;
} // main