Why does the following code make my computer beep?

Question

I\'m having a really hard time understanding why is this piece of code making my computer beep. I\'ve isolated this section of code to be the one producing the occasional beep,

Answer 1

The buffer probably contains a '\a' char which makes the computer beep. From 5.2.2 (Character display semantics) :

Alphabetic escape sequences representing nongraphic characters in the execution character set are intended to produce actions on display devices as follows:

• \a (alert) Produces an audible or visible alert without changing the active position.