ANSI C-清除字符串 [英] ANSI C - Clearing a string

问题描述

我有一个这样声明的字符串:

I've got a string declared like this:

str=malloc(sizeof(char)*128);

我想完全清除它，以便当我执行strncat()操作时，新字符将被写入str的开头.我需要清除它的原因是，我正在使用其自身的简化版本(删除多余的空白)来覆盖它.

I want to clear it completely so that whenI do strncat() operation, the new characters will be written to the beginning of str. The reason I need to clear it is that I'm writing over it with a simplified version of itself (deleting excess whitespace).

推荐答案

我建议您简单地这样做:

I suggest you simply do this:

*str = '\0';

您不需要清除缓冲区的全部内容.您可以将第一个char设置为零，然后得到一个空字符串.

You don't need to clear the entire contents of the buffer. You can just set the first char to zero and then you have the empty string.

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