/* Generate 16 bit random numbers using LCG.

   Constants from here:
   https://en.wikipedia.org/wiki/Linear_congruential_generator
*/

#include<stdio.h>

#define OUTPUT_WIDTH  256
#define OUTPUT_HEIGHT 256

static int state = 1;

static int lcg_random()
{
   state = state * 1103515245 + 12345;
   return (state >> 15) & 0xffff;
}

int main(int argc, char **argv)
{
   int x, y;

   printf("P2\n%d %d\n255\n", OUTPUT_WIDTH, OUTPUT_HEIGHT);
   for(y = 0; y < OUTPUT_HEIGHT; y++)
   {
      for(x = 0; x < OUTPUT_WIDTH; x++)
         printf(" %d", lcg_random() >> 8);
      putchar('\n');
   }
   return 0;
}