大小端判断

 1 #include <stdio.h>
 2 
 3 int checkCPU()
 4 {
 5     union w
 6     {
 7         int a;
 8         char b;
 9     }c;
10     c.a = 1;
11     return (c.b == 1); // 小端返回TRUE,大端返回FALSE
12 }
13 
14 int main()
15 {
16     int ret = 0;
17 
18     ret = checkCPU();
19     if (ret == 1)
20         printf("litttle endian\n");
21     else
22         printf("big endian\n");
23 
24     return 0;
25 }