C-Code

/********************************************
 * endian.c   Byte-Reihenfolge ermitteln
 * devnull    09-04-2014
 ********************************************/
#include <stdio.h>
int main() {
        int num = 1;
        char *pc = (char *) #
        printf("%s-Endian\n", (*pc)?"Little":"Big");
        return 0;
}

C-Code

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

/*
 * Idea behind this:
 *   Formatting a number to hexadecimal,
 *   because on a Little-Endian it would be "01 00"
 *   and on a Big-Endian it would be "00 01"
 */

int main(void)
{
   uint16_t num = (uint16_t) 1;
   char cha = *((char*)&num);
   printf("%s-Endian.\n", cha?"Little":"Big");
   return 0;
}