逻辑运算符的优先级 [英] Precedence of Logical Operators
问题描述
有人可以解释以下GCC警告的原因：
< shell-session>
$ cat test.c
#include< stdbool.h>
bool a，b，c，d ;
int x，y，z，u;
int main（无效）
{
d = a || b&& c;
u = x + y * z;
返回0;
}
$ gcc -Wall test.c
test.c：在函数中？main？：
test.c：8：警告：建议围绕&&的括号在||
< / shell-session>
为了保持一致性，为什么不在'y * z'周围建议括号好像
好吗？ （这将是荒谬的）
八月
-
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签名即可。此电子邮件受到GNU
通用公共许可证条款的影响。
Hi,
Can someone explain the reason for the warning from GCC below:
<shell-session>
$ cat test.c
#include <stdbool.h>
bool a, b, c, d;
int x, y, z, u;
int main(void)
{
d = a || b && c;
u = x + y * z;
return 0;
}
$ gcc -Wall test.c
test.c: In function ?main?:
test.c:8: warning: suggest parentheses around && within ||
</shell-session>
For sake of consistency, why not suggest parentheses around `y * z'' as
well? (which would be absurd)
August
--
I am the "ILOVEGNU" signature virus. Just copy me to your
signature. This email was infected under the terms of the GNU
General Public License.
推荐答案
cat test.c
#include< stdbool.h>
bool a，b，c，d;
int x，y，z，u ;
int main（无效）
{
d = a || b&& c;
u = x + y * z;
返回0;
}
cat test.c
#include <stdbool.h>
bool a, b, c, d;
int x, y, z, u;
int main(void)
{
d = a || b && c;
u = x + y * z;
return 0;
}
gcc -Wall test.c
test.c：在函数中？main？：
test.c：8：警告：建议括号和放大器;&安培;在||
< / shell-session>
为了保持一致性，为什么不在'y * z'周围建议括号好像
好吗？ （这将是荒谬的）
八月
-
我是ILOVEGNU签名病毒。只需将我复制到您的
签名即可。此电子邮件受到GNU
通用公共许可证条款的影响。
gcc -Wall test.c
test.c: In function ?main?:
test.c:8: warning: suggest parentheses around && within ||
</shell-session>
For sake of consistency, why not suggest parentheses around `y * z'' as
well? (which would be absurd)
August
--
I am the "ILOVEGNU" signature virus. Just copy me to your
signature. This email was infected under the terms of the GNU
General Public License.
2005-11-20，August Karlstrom< fu * *******@comhem.se>写道：
On 2005-11-20, August Karlstrom <fu********@comhem.se> wrote:
有人可以解释以下GCC警告的原因：
Hi,
Can someone explain the reason for the warning from GCC below:
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