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This reply to the question "I don't know C. And why should I learn it?" has me interested in learning C. What is a good self-instruction program (textbook/website/OpenCourseWare, etc.) for someone who already has lots of experience in high-level languages?

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This is a clichéd answer, but my intro to C programming was Kernighan and Richie's The C Programming Language.

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    No question this is the best resource to start with. Commented Dec 22, 2010 at 22:29
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    this is without question the best resource out there. thin, small, to the point. if you're experienced you'll know C in a few hours and instantly understand where all that stuff in the language you're using now came from. very informative.
    – Dr. McKay
    Commented Dec 22, 2010 at 23:15
  • The only drawback to using K&R2 is that it doesn't cover the C99 standard. Since C99 support is still somewhat spotty (glares at Microsoft), this may or may not be an issue. My day-to-day reference is Harbison & Steele's "C: A Reference Manual"; it's not a great teaching reference, but it will make an indispensable companion reference.
    – John Bode
    Commented Dec 23, 2010 at 0:21
  • Just to echo what the others have said, this book is essential reading, for anyone, far more so for learning C.
    – Orbling
    Commented Dec 23, 2010 at 0:34
  • Buy: amazon.co.uk/C-Programming-Language-2nd/dp/0131103628
    – Orbling
    Commented Dec 23, 2010 at 0:37
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If your goal truly is to understand what goes on under the hood, then perhaps, instead of learning C and writing a toy program in it, you instead look at a C compiler and understand how that works. As far as compilers go, a C compiler is one of the simplest, as the language doesn't have all that many high-level features.

As for which compiler, I would take a simple compiler with an easy to understand machine architecture, so you're not mucking about too much with x86 instructions.

I'd suggest the C-- compiler (written in Java) which outputs MIPS assembly.

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Leendert Ammeraal's "C For Programmers", while VERY dated now (15 years old or more) is by far the best thing I have ever seen along these lines.

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