Determine if computer processor is using little endian or big endian

endian_test.c

#include <stdio.h>

int main () {
  char x = 'x';
  char z = 'z';
  __int32_t w = x*(1<<24) + z;
  __int32_t* p = &w;
  char o = *(char*)p;

  if (o == z) {
    printf("processor is using little endian");
  } else {
    printf("processor is using big endian");
  }

  return 0;
}

// original, unused hardcoded test
int testEndianHardcoded() {
  __int32_t x = 0x7800007a;
  __int32_t* p = &x;
  char y = *((char*)p+3);

  printf("%i, %c", x, y);

  return 0;
}

// Co-authored by Greg Little