为什么cin需要输入换行符？ [英] Why does cin need newline to be entered?

问题描述

在此代码中：

char ch;
while(cin.get(ch))
{
    std::cerr<<"got ch:"<<ch<<std::endl;
}

为什么我必须在输入got ch：在屏幕上？

Why do I have to hit enter before the "got ch:" is printed on screen ?

有什么方法可以让字符在输入后立即回显？

Is there a way to have characters echoed right after they are typed ?

推荐答案

请参阅规范与非规范终端输入很多细节。

是的，默认情况下，您必须在任何数据可用之前输入return。

Yes, by default you have to enter return before any data is made available.

是的，有一些方法可以使用非规范输入，以便字符在输入后立即可用。然而，获取该行为的机制在Windows和基于Unix的系统之间是完全不同的。

Yes, there are ways to use non-canonical input so that characters are available as soon as they are entered. However, the mechanisms for obtaining that behaviour are radically different between Windows and Unix-based systems.

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