判断电脑是大端系统还是小端系统

union enidanUnion {
short shortValue;
char charValue[2];
};

/**
* 返回 -1 失效; 0 小端; 1 大端
*/
int testEnidan(void) {

union enidanUnion num;
if (sizeof(short) == 2) {

num.shortValue = 0x000F;
if (num.charValue[0] == 0 && num.charValue[1] == 15) {
printf("大端系统");
return 1;
} else if (num.charValue[0] == 15 && num.charValue[1] == 0) {
printf("小端系统");
return 0;
} else {
printf("本测试失效");
return -1;
}
} else {
printf("本测试失效");
return -1;
}
}