大小端存储

#include <stdio.h>

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

    un.s = 0x0102;
    if(sizeof(short)==2)
    {
        if(un.c[0]==1&&un.c[1]==2){
            printf("big-endian\n");
        }else if(un.c[0]==2&&un.c[1]==1){
            printf("little-endian\n");
        }else{
            printf("unknown\n");
        }
    }else
    {
        printf("sizeof(short)=%d\n",sizeof(short));
    }
}


//centos6.4
little-endian