Is the header file in C++ referenced & lt;iostream.h> or & lt;iostream>

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Is the header file referenced or?

There are still programmers in the code that are still used instead of libraries. Actually, there is a difference between the two libraries:

First of all, it is clearly not recommended to use .h as the standard header file.

Second, in terms of functionality, it includes the IO class and supports both narrow and wide characters, while only char-oriented streams are supported.

Thirdly, the iostream interface standard of C++ has been adjusted. There are differences in the interface and implementation of.

Finally, the component is declared in the std namespace, and the component is global. There are certain risks in the mixed use of the two. You need to be careful.

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