endian-checker.c

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


int main() {

  union 
  {
    uint8_t  c[4];
    uint32_t i;
  } u;

  u.i = 0x01020304;

  if (0x04 == u.c[0])
    printf("Little endian\n");
  else if (0x01 == u.c[0])
    printf("Big endian\n");


  int num = 1;
  if(*(char *)&num == 1) {
    printf("\nLittle-Endian\n");
  } else {
    printf("Big-Endian\n");
  }

  return 0;
}