问题描述
我使用Dev C ++ 5.11。 TDM-GCC 4.8.1
I use Dev C++ 5.11. TDM-GCC 4.8.1
并且此代码运行良好。
#include<iostream>
using namespace std;
int main()
{
printf("%d\n", 42);
cout << "good";
}
但是据我所知，iostream不包含 printf。 （）
But as far as I know, iostream does not include "printf". (http://en.cppreference.com/w/cpp/header/iostream)
为什么运行此代码？ iostream acutally包括printf吗？
Why this code run? iostream acutally include printf? Is it a kind of standard?
推荐答案
系统/标准头文件中包含的头文件列表取决于库实现（通常与您使用的编译器相关联），并且（据我所知）C ++标准并不禁止一个头文件自动包含另一个头文件
The list of header files included in a system/standard header file is library implementation dependent (that is usually associated with the compiler you're using), and (as far as I remember) the C++ standard does not prohibit one header file from automatically including another one
在您的情况下，< iostream> 也可能包含#include < stdio.h> （或< cstdio> ）。
In your case <iostream> is probably also #including <stdio.h> (or <cstdio>).
依赖包含在另一个文件中的头文件不可移植到不同的标准库，编译器和平台，因此最好确保您明确地#include所需的所有内容。
Relying on a header file being included in another is non portable to different standard libraries, compilers and platforms, so it's better to make sure that you explicitly #include everything you need.
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