正确的方法来清空C字符串(Proper way to empty a C

正确的方法来清空C字符串(Proper way to empty a C-String)

我一直在用C语言开发一个项目，需要我大量使用字符串。 通常情况下，我使用C ++编程，所以这与仅说string.empty（）有点不同。

我想知道在C中清空字符串的正确方法是什么？会是这样吗？

buffer[80] = "Hello World!\n"; // ... strcpy(buffer, "");

I've been working on a project in C that requires me to mess around with strings a lot. Normally, I do program in C++, so this is a bit different than just saying string.empty().

I'm wondering what would be the proper way to empty a string in C. Would this be it?

buffer[80] = "Hello World!\n"; // ... strcpy(buffer, "");

最满意答案

这取决于你的意思是“空”。 如果你只是想要一个零长度的字符串，那么你的例子将工作。

这也将起作用：

buffer[0] = '\0';

如果你想把字符串的全部内容清零，你可以这样做：

memset(buffer,0,strlen(buffer));

但是这只会用于调零至第一个NULL字符。

如果字符串是一个静态数组，你可以使用：

memset(buffer,0,sizeof(buffer));

It depends on what you mean by "empty". If you just want a zero-length string, then your example will work.

This will also work:

buffer[0] = '\0';

If you want to zero the entire contents of the string, you can do it this way:

memset(buffer,0,strlen(buffer));

but this will only work for zeroing up to the first NULL character.

If the string is a static array, you can use:

memset(buffer,0,sizeof(buffer));