Elementary Cellular Automata in C

eca.c

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

#define CN 180
#define ST 80

int main(void)
{
  char r[8], c[CN], cn[CN], b, x, y, z;

  for (int rule = 0; rule < 256; rule++) {
    for (b = rule, x = 0; x < 8; x++) { r[x] = b & 0x01 ? 1 : 0; b >>= 1; }
    for (int i = 0; i < CN; i++) c[i] = 0; c[CN/2] = 1;

    system("clear");
    for (int j = 0; j < ST; j++) {
      for (int i = 0; i < CN; i++) printf("%c", c[i] ? '*' : ' ');
      printf("\n");
      for (int i = 0; i < CN; i++)
        cn[i] = r[(i == 0 ? 0 : c[i-1])*4+c[i]*2+(i == CN-1 ? 0 : c[i+1])];
      for (int i = 0; i < CN; i++) c[i] = cn[i];
    }
    usleep(300000);
  }

  return 0;
}