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

int main()
{
    int x = 0x01234567;
    for (int i = 0; i < sizeof(int); i++)
    printf("%.2x ", ((char *)&x)[i]);
    printf("\n");
 
    if (((char *)&x)[0] == 0x67) 
    {
        printf("little endian!\n");
    } else if (((char *)&x)[0] == 0x01) {
        printf("big endian\n");
    }
}

int checkSystem( )
{
    union check {
        int I;
        char ch;
    } c;
   
    c.i = 1;
    
    if (c.ch == 1) {
        printf("little endian!\n");
    } else {
        printf("big endian!\n");
    }
}