printf长度修饰符 [英] printf length modifier

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本文介绍了printf长度修饰符的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

您好,


以下代码是否会调用未定义的行为?


#include< stdio.h>

int main(无效)

{

unsigned short int u = 42;

printf("%u \ n" ,u);

返回0;

}


gcc似乎并不介意。

$ gcc -Wall -Wextra -std = c89 -pedantic zzz.c

$ ./a.out




是否必须在格式字符串中添加h长度修饰符?


unsigned short int u = 42;

printf( "%hu \ n",u);


问候。

Hello,

Does the following code invoke undefined behavior?

#include <stdio.h>
int main(void)
{
unsigned short int u = 42;
printf("%u\n", u);
return 0;
}

gcc doesn''t seem to mind.
$ gcc -Wall -Wextra -std=c89 -pedantic zzz.c
$ ./a.out
42

Is it mandatory to add the ''h'' length modifier in the format string?

unsigned short int u = 42;
printf("%hu\n", u);

Regards.

推荐答案

gcc -Wall -Wextra -std = c89 -pedantic zzz.c
gcc -Wall -Wextra -std=c89 -pedantic zzz.c


./ a.out




是否必须在格式字符串中添加''h''长度修饰符?


unsigned short int u = 42;

printf(" ;%hu \ n",u);


Rega rds。
./a.out
42

Is it mandatory to add the ''h'' length modifier in the format string?

unsigned short int u = 42;
printf("%hu\n", u);

Regards.


Spoon写道:
Spoon wrote:

>

请执行以下代码调用未定义的行为?


#include< stdio.h>

int main(无效)

{

unsigned short int u = 42;

printf("%u\\\
",u);

返回0;

}
>
Does the following code invoke undefined behavior?

#include <stdio.h>
int main(void)
{
unsigned short int u = 42;
printf("%u\n", u);
return 0;
}



是。

Yes.


>

gcc doesn'好像在想。
>
gcc doesn''t seem to mind.


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