使用cout时发出奇怪的嘟嘟声 [英] Strange beep when using cout

问题描述

今天，当我在处理一些我的代码时，我在屏幕上打印缓冲区时遇到一个哔声。
这是产生嘟嘟声的神秘字符：''
我不知道你是否可以看到它，但是当我尝试打印它时，我的电脑会发出蜂鸣声：

today when I was working on some code of mine I came across a beeping sound when printing a buffer to the screen. Here's the mysterious character that produces the beep: '' I don't know if you can see it, but my computer beeps when I try to print it like this:

cout<<(char)7<<endl;

另一个有趣的地方是，嘟嘟不是从我的车上蜂鸣器，从我的耳机/扬声器

Another point of interest is that the 'beep' doesn't originate from my on board beeper, but from my headphone/speaker

这是我的电脑还是cout功能有问题？

Is this just my computer or there something wrong with the cout function?

：

但是为什么打印这个字符会产生蜂鸣声？

But then why does printing this character produce the beep sound? does that mean that I could send other such characters through the cout function to produce different effects?

推荐答案

在ASCII中，字符7是bell字符表示终端应该发出哔声。

In ASCII the character 7 is the "bell" character that signals to the terminal that it should beep.

编辑：为了回答你的后续问题，这只是因为历史原因。旧的电传终端需要一种方式来提醒操作者输入的消息，因此使用了铃。

To answer your followup question, it's really just for historical reasons. The old teletype terminals needed a way to alert the operator of an incoming message so a bell was used. The bell character told the terminal to ring the bell rather than print a character.

现代终端仿真器基本上做同样的事情，虽然他们通常有一个选项来替换声音钟与视觉一。

Modern terminal emulators do essentially the same thing, although they usually have an option to replace the audible bell with a visual one.

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