Help with Constants.

[Ekko Finch]

Okay, so I have been trying to learn C++ for a while, and I have run into a problem with constants. I was wondering how do I know that
75
0113
0x4b
All of these numbers can mean different things, is there like a library of all of these hexadecimal numbers. They said that 0x4b = 75 (C++ pun?) How am I supposed to know that?

[Lynx876]

http://www.statman.info/conversions/hexadecimal.html

75 = 4b.
0x, the prefix for numeric constants represented in Hexadecimal.

So, 75 = 0x4b

[Ekko Finch]

Thanks!