大小端模式测试程序

#include <stdio.h> typedef union mode { int a;  short b; }m;void testMode(){m c={0x01};if(c.b==0x1000) {  printf("%d/n",c.b);  printf("大端模式/n"); }else if(c.b==0x01) {  printf("%d",c.b);  printf("小端模式/n"); }}int main(){ testMode(); m d={0x1000}; printf("b=%d/n",d.a); return 0;}

 

说明：因为CPU是三十二位的，所以，一次读入32位数据。

 

#include <stdio.h>        typedef union mode        {       int a;                short b;        }m;void testMode(){m c={0x12345678}; printf("c.b的十进制是：%x/n",c.b);if(c.b==0x1234)        {                printf("%d/n",c.b);                printf("大端模式/n");        }

else if(c.b==0x5678)        {                printf("%d",c.b);                printf("小端模式/n");        }}int main(){        testMode();        m d={0x1000};        printf("b=%d/n",d.a);        return 0;}

 

可以判断是小端模式，d.a=4096