'#include< stdio.h>'是什么确实在C程序中 [英] What does '#include <stdio.h>' really do in a C program

问题描述

我是C编程的新手，我正在编写一些简单的程序"Hello world"风格.

在所有这些程序中，我都将#include< stdio.h> 放在顶部，但是我不确定这到底意味着什么.我搜索了一下，发现stdio.h是一个包含预处理程序命令的文件，但是什么是预处理程序?我以为在编写代码时，我会对其进行编译并将代码转换为计算机"可以读取然后可以运行的形式.有人可以给我解释一下此命令的用法吗?

解决方案

它将查找 stdio.h 文件，并有效地将其复制粘贴到此 #include 语句.该文件包含函数的所谓函数原型，例如 printf()， scanf()等，以便编译器知道它们的参数和返回值./p>

I am new to c programming and I was coding some simple programs "Hello world" style.

In all of these programs I put #include<stdio.h> in the top but I am not sure what this means exactly. I googled it and I found that stdio.h is a file that has commands for the preprocessor, but what is a preprocessor? I thought when I write code, I compile it and my code transforms to a form that a "computer" can read and then I can run it. Can somebody explain to me what the usage of this command is?

解决方案

It looks for the stdio.h file and effectively copy-pastes it in the place of this #include statements. This file contains so-called function prototypes of functions such as printf(), scanf(), ... so that compiler knows what are their parameters and return values.

这篇关于'#include< stdio.h>'是什么确实在C程序中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！