Linked by Thom Holwerda on Tue 28th Aug 2012 19:20 UTC, submitted by MOS6510
General Development "Coming from a background in higher-level languages like Ruby, Scheme, or Haskell, learning C can be challenging. In addition to having to wrestle with C's lower-level features like manual memory management and pointers, you have to make do without a REPL. Once you get used to exploratory programming in a REPL, having to deal with the write-compile-run loop is a bit of a bummer. It occurred to me recently that I could use gdb as a pseudo-REPL for C. I've been experimenting with using gdb as a tool for learning C, rather than merely debugging C, and it's a lot of fun. My goal in this post is to show you that gdb is a great tool for learning C. I'll introduce you to a few of my favorite gdb commands, and then I'll demonstrate how you can use gdb to understand a notoriously tricky part of C: the difference between arrays and pointers."
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Not REPL
by ndrw on Wed 29th Aug 2012 07:56 UTC
ndrw
Member since:
2009-06-30

Gdb is a good tool for learning low-level representations of programs (not just these written in C). Nothing beats exploring memory/stack/data structure with your own hands. It can also be useful in debugging but at large scale it is less efficient than tracing.

But REPL? No way. Yes, gdb can perform some primitive C operations (arithmetics, dereferencing pointers) but that's about it. What about calling user-defined functions and defining them? Or, mallocing memory, connecting to the net, opening and parsing files? Even if all this was possible, C is simply too low level to make it a convenient way of writing programs.

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