我是否必须使用 #include <string>在 <iostream> 旁边?

2021-12-25 00:00:00 string types include iostream c++

我开始学习 C++，我读了一本书，书中写道我必须使用 <string> 头文件，因为字符串类型不是直接内置到编译器中的.如果我使用 我可以使用字符串类型.

I started learning C++ and I read a book which writes that I must use the <string> header file because the string type is not built directly into the compiler. If I use the <iostream> I can use the string type.

如果我包含 标头，当我想使用字符串类型时，是否必须包含 标头?为什么?有什么区别吗?

Do I have to include the <string> header when I want to use the string type if I included the <iostream> header? Why? Is there some difference?

推荐答案

是的，您必须包含您使用的内容.标准头相互包含并不是强制性的(IIRC 除外).它现在可能可以工作，但在不同的编译器上可能会失败.

Yes, you have to include what you use. It's not mandated that standard headers include one another (with a few exceptions IIRC). It might work now, but might fail on a different compiler.

在您的情况下，显然 包括 ，直接或间接，但不要依赖它.

In your case, apparently <iostream> includes <string>, directly or indirectly, but don't rely on it.

相关文章