什么是在C函数“睡眠”正确的#include？ [英] What is the proper #include for the function 'sleep' in C?

问题描述

我现在用的大牧场书呆子书Objective-C编程，它通过让我们写C中的前几章开始了。在我的计划已经创造了我一个，我用的是睡眠功能。在这本书中它告诉我把的#include＆LT;文件stdlib.h＆GT; 在的#include＆LT; stdio.h中＆GT; 部分。这应该摆脱，上面写着功能休眠的隐式声明是无效C​​99的警告。但由于某些原因后，我把的#include＆LT;＆stdlib.h中GT; ，警告将不会消失。这问题不从运行正常停止程序，但我只是好奇哪个的#include 我需要使用！

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!

推荐答案

睡眠手册页说，这是在＆LT宣布; unistd.h中＆GT; 。你有没有在你的程序包含在此？

The sleep man page says it is declared in <unistd.h>. Have you included this in your program?

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