将单个字符转换为字符串？ [英] Convert a single character to a string?

问题描述

简单问题（在C ++中）：

如何将字符转换为字符串。
例如，我有一个字符串str =abc;

我想提取第一个字母，但我想它是一个字符串$

  
 string firstLetter = str [0] +; 
  

和

  string firstLetter =& str [0]; 
  

无效。想要吗？

解决方案

如果你使用的是STL，
$ b

  string firstLetter（1，str [0]）; 
  

Simple question (in C++):

How do I convert a character into a string. So for example I have a string str = "abc";

And I want to extract the first letter, but I want it to be a string as opposed to a character.

I tried

string firstLetter = str[0] + "";

and

string firstLetter = & str[0]; 

Neither works. Ideas?

解决方案

Off the top of my head, if you're using STL then do this:

string firstLetter(1,str[0]);

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