Linux 上的 C++ 无法识别 exit() 和 printf() 等命令
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C++ on Linux not recognizing commands like exit() and printf()
提问by Max
I get these errors after issuing a g++ command on a .cpp file: error: ‘exit' was not declared in this scope error: ‘printf' was not declared in this scope
在 .cpp 文件上发出 g++ 命令后，我收到这些错误：错误：'exit' 未在此范围内声明错误：'printf' 未在此范围内声明
The problem is that when I compiled this program on another linux machine, everything went fine. I tried searching around, but all I found was that I need to include files like 'stdlib.h'.
问题是当我在另一台 linux 机器上编译这个程序时，一切都很好。我试着四处搜索，但我发现我需要包含像“stdlib.h”这样的文件。
Could it be I'm missing some library on my OS? If so, what might it be?
难道我的操作系统上缺少一些库？如果是这样，那可能是什么？
采纳答案by Ignacio Vazquez-Abrams
Recent versions of GCC have gotten stricter in what responsibilities the programmer needs to fulfill. Include the cstdlib, cstdio, etc. header and access these functions from the stdnamespace.
最新版本的 GCC 在程序员需要履行的职责方面变得更加严格。包括cstdlib，cstdio等头部和访问从这些函数std的命名空间。
回答by shuttle87
If you are in need of a quick (and dirty) fix try:
如果您需要快速（且肮脏）的修复，请尝试：
using namespace std;
Also make sure you are including the appropriate io headers.
还要确保包含适当的 io 标头。
回答by sanjeev
In terminal :- when you write man exit :- it will show
在终端中：- 当您编写 man exit 时：- 它将显示
exit - cause normal process termination
SYNOPSIS #include stdlib.h
概要#include stdlib.h
void exit(int status);
so you required to define header #include stdlib.h
所以你需要定义头 #include stdlib.h
回答by Mike S
Specifically for ‘exit' was not declared in this scopeall you need is:
特别适合‘exit' was not declared in this scope您需要的是：
#include <stdlib.h>
