字符串修改 [英] string modification

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本文介绍了字符串修改的处理方法,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

大家好。我无法理解为什么以下程序无法正常工作。请解释。


int main()

{

char * t =" hello",* r;

r = t;

* r =''H'';

printf("%s",t);

返回0;

}

导致分段错误.Bye 。


问候,

Jerico

Hi all.I could not understand why the following program didn''t work.Please explain.

int main()
{
char *t="hello",*r;
r=t;
*r=''H'';
printf("%s",t);
return 0;
}
It results in segmentation fault.Bye.

Regards,
Jerico

推荐答案


大家好。我无法理解为什么下面的程序不起作用。请解释。


int main()

{

char * t =" hello",* r;

r = t;

* r =''H'';

printf("%s",t);

返回0;

}

导致分段错误.Bye 。


问候,

Jerico
Hi all.I could not understand why the following program didn''t work.Please explain.

int main()
{
char *t="hello",*r;
r=t;
*r=''H'';
printf("%s",t);
return 0;
}
It results in segmentation fault.Bye.

Regards,
Jerico



问题在于分配给你好"在程序数据段中,因此受到保护,任何修改它的尝试都会导致分段错误。您可以使用strdup函数来解决这个问题。这将在堆中创建一个可以自由修改的副本。

The problem is that the memory allocated for "hello" is in the programs data segment and is therefore protected and any attempt to modify it will result in a segmentation fault.. You can get around this by using the strdup function. This will create a duplicate in the heap that you can freely modify.

展开 | 选择 | Wrap | 行号


嗨jerico,


int main()

{

char * t =" hello",* r;

r = t;

* r =''H'';

printf("%s",t);

返回0 ;

}


我无法理解你的动机。如果你想重新分配一些字符串,那就无法更新常量数据了。


顺便说一下,来自哪里?
Hi jerico,

int main()
{
char *t="hello",*r;
r=t;
*r=''H'';
printf("%s",t);
return 0;
}

I could not understand ur motivation. If you wanted to reassign some string then its not possible to update a constant data.

By the way where r u from?


我看到了这样:


int main()

{

// char * t =" hello",* r ;
I see it in this way:

int main()
{
// char *t="hello",*r;
//" hello"被认为是const,所以它在数据段中并且不能被改变

char t [] =" hello",* r;

char t[]="hello",*r;

//" hello"被认为是数组,所以它在堆栈中(如果你更喜欢堆使用strdup)

r = t;

* r =''H'';

printf("%s",t);

返回0;

}

r=t;
*r=''H'';
printf("%s",t);
return 0;
}


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