一个基本c问题不解啊．为什么比较的结果都是不一样呢？

zbazba

#include <stdio.h>

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

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

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／

liniuer

if(readbyte & 0x38 == 0x38)这一句，“==”的优先级比按位与“&”的优先级高，不啰嗦了。。。

huangyiting1990

楼上正解！  这个   if(readbyte & 0x38 == 0x38)  判断的只是readbyte的真假

zbazba

谢谢了！