Judge the Little/Big Endian

#include <stdio.h>

union
{
    short s;
    char c[sizeof(short)];
}un;

int main (int argc, char *argv[])
{
    /*
    un.s=0x0102;
    if(un.c[0]==2&&un.c[1]==1)
    {
        printf("little endian \n");
    }
    else if(un.c[0]==1&&un.c[1]==2)
    {
        printf("big endian \n");
    }
    else
    {
        printf("Unknow\n ");
    }
    */

    //more simple way
    short i = 0x0102;

    if(*(char*)&i == 0x02)
        printf("little endian \n");
    else
        printf("Big endian\n");

    return 0;
}