/*-----------------------------------------------------------------------
      Cube                                     Susan L. Weller
  -----------------------------------------------------------------------
           This program will generate a given number of points that
   lie inside a cube.  The number of points is given on command line.
  -----------------------------------------------------------------------*/

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

#define MAX_INT	   2147483647

main( argc, argv )
int argc;
char *argv[];
{
int n;
double x, y, z;

srandom( (int) time( (long *) 0 ) );
if ( argc != 2 ) {
     printf("Usage: cube <number of random points>\n");
     exit(1);
     }

n = atoi( argv[1] );

while ( n-- ) {
              x = 2.0 * (double) random() / MAX_INT - 1.0;
              y = 2.0 * (double) random() / MAX_INT - 1.0;
              z = 2.0 * (double) random() / MAX_INT - 1.0;
              printf ("%6d  %6d  %6d\n", (int) (100*x ),  (int) ( 100*y ),
                        (int) (100 * z) );
              }

}