Hackers should atleast 5 programming languages. Before all ,learn c program . Because it is basic programming language for all programming language. It is easy to learn also.

There are many books available to read like Complete reference c, C for dummies. In online also you can learn.

One of best website to learn c program is www.cprogramming

How to compile c program?
Download "Turbo c " compiler and install. it. :

download Now open the tc.exe in the folder "c:\tc\bin"

Select New in File Menu of the turbo c editor.

and type your coding . save it with ".c"

extension Like hello.c

compile:
press alt+f9

Create exe file: press f9

Run : ctrl+f9

if my post is not clear for you ask me doubts as comment