error: ‘NULL’ was not declared in this scope(错误:未在此范围内声明“NULL)
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本文介绍了错误:未在此范围内声明“NULL"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
在 gcc 4.3 上编译 C++ 时收到此消息
I get this message when compiling C++ on gcc 4.3
error: ‘NULL’ was not declared in this scope
它出现又消失，我不知道为什么.为什么?
It appears and disappears and I don't know why. Why?
谢谢.
推荐答案
NULL 不是关键字.它是一些标准头文件中定义的标识符.你可以包括
NULL is not a keyword. It's an identifier defined in some standard headers. You can include
#include <cstddef>
将其纳入范围，包括一些其他基础知识，例如 std::size_t.
To have it in scope, including some other basics, like std::size_t.
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