用函数判断系统是Big Endian还是Little Endian

 

#include <stdio.h>;

union {
        long Long;
        char Char[sizeof(long)];
}u;

int main(void)
{
        u.Long = 1;

        if (u.Char[0] == 1)
                printf("小端\n");
        else if (u.Char[sizeof(long) - 1] == 1)
                printf("大端\n");
        else
                printf("addressing is strange\n");

        return 0;
}




或者


bool IsBig_Endian()
//如果字节序为big-endian，返回true;

//反之为 little-endian，返回false

{
    unsigned short test = 0x1122;
    if(*( (unsigned char*) &test ) == 0x11)
       return TRUE;
    else
       return FALSE;
}