How do I represent an integer in hexidecimal form in the code?

How do I use the hexidecimal system in my code? Something like...

Code:

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int my_int = F61B;

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And other numbering systems for that matter, though hexidecimal is the only one I actually need for the moment. By "other systems", I mean binary and possibly octal if it is supported.

http://msdn2.microsoft.com/en-US/library/2k2xf226.aspx

you can't use constants in binary form. If you know hex or octals well, that should suffice.

edit: that's a page for the C standard, but C++ uses the same.