函数“sleep()"的正确#include 是什么? [英] What is the proper #include for the function 'sleep()'?

问题描述

我正在使用 Big Nerd Ranch 的书籍 Objective-C Programming，它首先让我们在前几章中用 C 编写.在我创建的其中一个程序中，我使用了睡眠功能.在书中，它告诉我将 #include 放在 #include 部分下.这应该消除C99 中函数‘睡眠’的隐式声明无效"的警告.但是出于某种原因，在我放入 #include <stdlib.h> 后，警告并没有消失.. 这个问题并没有阻止程序正常运行，但我只是好奇哪个 #include 我需要使用！

解决方案

睡眠 手册页 表示它在 中声明.

简介:

#include 

<块引用>

unsigned int sleep(unsigned int seconds);

I am using the Big Nerd Ranch book Objective-C Programming, and it starts out by having us write in C in the first few chapters. In one of my programs it has me create, I use the sleep function. In the book it told me to put #include <stdlib.h> under the #include <stdio.h> part. This is supposed to get rid of the warning that says "Implicit declaration of function 'sleep' is invalid in C99". But for some reason after I put #include <stdlib.h>, the warning does not go away.. This problem does not stop the program from running fine, but I was just curious on which #include I needed to use!

解决方案

The sleep man page says it is declared in <unistd.h>.

Synopsis:

#include <unistd.h>

unsigned int sleep(unsigned int seconds);

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