清除 char 数组 c [英] clearing a char array c

问题描述

我认为将第一个元素设置为 null 会清除 char 数组的全部内容.

I thought by setting the first element to a null would clear the entire contents of a char array.

char my_custom_data[40] = "Hello!";
my_custom_data[0] = '';

但是，这只会将第一个元素设置为 null.

However, this only sets the first element to null.

或

my_custom_data[0] = 0; 

而不是使用memset，我认为上面的2个例子应该清除所有数据.

rather than use memset, I thought the 2 examples above should clear all the data.

推荐答案

这取决于你想如何查看数组.如果您将数组视为一系列字符，那么清除数据的唯一方法是触摸每个条目.memset 可能是实现这一目标的最有效方法.

It depends on how you want to view the array. If you are viewing the array as a series of chars, then the only way to clear out the data is to touch every entry. memset is probably the most effective way to achieve this.

另一方面，如果您选择将其视为 C/C++ 空终止字符串，则将第一个字节设置为 0 将有效地清除该字符串.

On the other hand, if you are choosing to view this as a C/C++ null terminated string, setting the first byte to 0 will effectively clear the string.

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