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?
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.
What is inside .lib file of Static library, Statically linked dynamic library and dynamically linked dynamic library?(静态库、静态链接动态库和动态链接动态库的 .lib 文件里面是什么?)
