gists/c-programming/jokes/bytebeat-cryptic.c

/*
 * bytebeat-cryptic.c
 *
 * NOTE: PulseAudio: Pipe STDOUT of this program to aplay -c 1 -f U8 -r 44100
 *
 * Author: Intel A80486DX2-66
 * License: Unlicense
 */

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

int main(void) {
  srand(time(NULL));

  volatile float k[] = {0.7088250000000000f, 0.9451000000000000f,
                        1.2601333301830002f, 1.4176500000000000f};

  unsigned A = 4294967295, B = rand();

  for (unsigned i = 0; i < 3; i++) {
    for (unsigned j = 1; j < 4; j++) {
      if (rand() & 1) {
        k[i] = *(float*)(unsigned[]){(*(unsigned*)&k[i]) ^ (*(unsigned*)&k[j])};
        k[j] = *(float*)(unsigned[]){(*(unsigned*)&k[j]) ^ (*(unsigned*)&k[i])};
        k[i] = *(float*)(unsigned[]){(*(unsigned*)&k[i]) ^ (*(unsigned*)&k[j])};
      }
    }
  }

  while (1) {
    float C = k[(A / 65536) & 0b11];
    C *= ((B >> ((7 & A >> 13) << 1)) & 6);
    unsigned D = ++A * C / 4;
    putchar(D);
  }
}