如何将字符串复制到C ++中的固定长度字符串 [英] How to copy string into fixed length string in C++

问题描述

我有一个字符串，我想复制到一个固定长度的字符串。例如，我有一个 string s =这是一个字符串，长度为16个字符。

I have a string which I want to copy into a fixed length string. For example I have a string s = "this is a string" that is 16 characters long.

将它复制到长度为4个字符的固定长度字符串 s2 。因此 s2 将包含this。

I want to copy this into a fixed length string s2 that is 4 characters long. So s2 will contain "this".

I也想将它复制到固定长度的字符串 s3 ，这是20个字符长。

I also want to copy it into a fixed length string s3 that is 20 characters long. The end of the string will have extra spaces since the original string is only 16 characters long.

推荐答案

s.resize(expected_size,' '); 

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