- 大端：高位内存存储低序字节
- 小端：高位内存存储高序字节
- short a = 0x0102，其中 01 高序字节， 02 低序字节
#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));}exit(0);
}
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