#include <stdio.h>

void fun1(void)
{
char readbyte = 0;
char temp = 0;
readbyte = 0x93;
printf("------------------fun1 ");
if(readbyte & 0x80)
{
printf("aaaaaaaaaaaaaaaa ");
readbyte = 0xc7;
temp = readbyte & 0x38;
printf("temp: %x ", temp);
if(readbyte & 0x38 == 0x38)
{
printf("bbbbbbbbbbbbbbbbbbbb ");
}
else
{
printf("cccccccccccccccccc ");
}
}
}

void fun2(void)
{
char readbyte = 0;
char temp = 0;
readbyte = 0x93;
printf("------------------fun2 ");
if(readbyte & 0x80)
{
printf("aaaaaaaaaaaaaaaa ");
readbyte = 0xc7;
temp = readbyte & 0x38;
printf("temp: %x ", temp);
if(temp == 0x38)
{
printf("bbbbbbbbbbbbbbbbbbbb ");
}
else
{
printf("cccccccccccccccccc ");
}
}
}

int main(void)
{
fun1();
fun2();
return 0;
}
请看比较的if那里．　fun1 fun2函数打印的结果不一样／