/* From: "COMPUTATIONAL PHYSICS, 2nd Ed" 
   by RH Landau, MJ Paez, and CC Bordeianu 
   Copyright Wiley-VCH, 2007.
   Electronic Materials copyright: R Landau, Oregon State Univ, 2007;
   MJ Paez, Univ Antioquia, 2007; & CC Bordeianu, Univ Bucharest, 2007
   Support by National Science Foundation
*/
//  random.c:  A simple random number generator, not for serious work  
#include <stdio.h>
#define max 1000                       // number of numbers generated
#define seed 11                          // seed for number generator

main () {
	
  int i, old, newx, newy;
	
  FILE *output;                           // save data in badrand.dat
  output= fopen("badrand.dat","w");
  old= seed;                                              // the seed
  for (i = 0; i<max; i++)   {              // generating #max numbers
    newx= (57*old+1) % 256;                           // x-coordinate
    newy= (57*newx+1) % 256;                          // y-coordinate
    fprintf (output, "%i\t%i\n", newx, newy);
    old = newy;
  }
  printf("data stored in badrand.dat.\n");
  fclose(output);
}