/* sierpinski0.c - Don Yang (uguu.org)

   01/07/07
                                                                           */

#include<stdio.h>

#define WIDTH 79
#define CENTER 34

int main(void)
{
   int cell[WIDTH];
   int x, y, left, current;
   for(x = 0; x < WIDTH; x++)
      cell[x] = (int)(x == CENTER);
   for(y = 0; y < 32; y++)
   {
      for(x = left = 0; x < WIDTH - 1; x++)
      {
         current = cell[x];
         cell[x] = left ^ cell[x + 1];
         left = current;
         (void)putchar(" X"[current]);
      }
      (void)putchar('\n');
   }
   return 0;
}