What is a Magic Number

[temityao]

please can someone tell me what a magic nuber is and its uses in C++...thanks in advance

[Zhuge]

Have you tried Googling it?

temityao wrote:

...and its uses in C++...

The fact that you ask it means you clearly have no idea what it is and you haven't even tried to research it yourself.

[Moschops]

It's a way of making things difficult for anyone who ever has to read your code, including yourself in a week's time.

[z05DSL3A]

It is many things.
see: http://en.wikipedia.org/wiki/Magic_number_(programming)

[rocketboy9000]

check this out! http://en.wikipedia.org/wiki/Fast_inverse_square_root

[temityao]

i tried every search engine i know, but everything is really complicating