C++ #include <iostream.h> 和 #include <iostream> 之间的区别是什么？
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What is the différence between #include <iostream.h> and #include <iostream>?
提问by Joseph Mansfield
What is the difference between
之间有什么区别
#include <iostream.h>
#include <iostream.h>
and
和
#include <iostream>
#include <iostream>
?
?
回答by Joseph Mansfield
Before C++ was even standardised, the I/O library was developed as <iostream.h>. However, that header has never been a standard C++ header. Some older compilers continued to distribute the <iostream>header also as <iostream.h>. Use <iostream>because it is guaranteed by the standard to exist.
在 C++ 甚至标准化之前，I/O 库被开发为<iostream.h>. 但是，该头文件从来都不是标准的 C++ 头文件。一些较旧的编译器继续将<iostream>标头也作为<iostream.h>. 使用<iostream>是因为标准保证它存在。
It's worth noting that the only standard headers that end with .hare the C standard library headers. All C++ standard library headers do not end with .h.
值得注意的是，唯一.h以 C 标准库头文件结尾的标准头文件。所有 C++ 标准库头文件都不以.h.
回答by StepUp
<iostream>is the usual header
<iostream>是通常的标题
<iostream.h>is the old header, not longer supported by some compilers
<iostream.h>是旧头文件，某些编译器不再支持
回答by Claudio
It just depends on the name of the file provided by your toolchain. Some (old) compilers use .h files. Modern compilers usually use (without the .h extension).
它只取决于您的工具链提供的文件的名称。一些（旧）编译器使用 .h 文件。现代编译器通常使用（没有 .h 扩展名）。
