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GNU Debugger(GDB) The GNU Debugger, aka GDB, is one of the most powerful Linux debuggers available to modern programmers. It is a robust tool with an extensive set of features. GDB has built-in support for many popular programming languages, including C, C++, Fortran, and Java.
GNU Debugger, also known as gdb, allows us to sneak through the code while it executes or what a program was trying to do at the moment before it crashed. GDB basically helps us to do four main things to catch flaws in the source code. Start the program, specifying arguments that may affect the general behavior.
Gdb is a debugger for C (and C++). It allows you to do things like run the program up to a certain point then stop and print out the values of certain variables at that point, or step through the program one line at a time and print out the values of each variable after executing each line.
gdb is the acronym for GNU Debugger. This tool helps to debug the programs written in C, C++, Ada, Fortran, etc. The console can be opened using the gdb command on terminal.
ddd is a graphical front-end to gdb that is pretty nice. One of the down sides is a classic X interface, but I seem to recall it being pretty intuitive.
You could try using Insight a graphical front-end for gdb written by Red Hat Or if you use GNOME desktop environment, you can also try Nemiver.
You may want to check out Eclipse CDT. It provides a C/C++ IDE that runs on multiple platforms (e.g. Windows, Linux, Mac OS X, etc.). Debugging with Eclipse CDT is comparable to using other tools such as Visual Studio.
You can check out the Eclipse CDT Debug tutorial that also includes a number of screenshots.
Qt Creator, apart from other goodies, also has a good debugger integration, for CDB, GDB and the Symnbian debugger, on all supported platforms. You don't need to use Qt to use the Qt Creator IDE, nor do you need to use QMake - it also has CMake integration, although QMake is very easy to use.
You may want to use Qt Creator as the IDE to teach programming with, consider it has some good features:
Perhaps it is indirect to gdb (because it's an IDE), but my recommendations would be KDevelop. Being quite spoiled with Visual Studio's debugger (professionally at work for many years), I've so far felt the most comfortable debugging in KDevelop (as hobby at home, because I could not afford Visual Studio for personal use - until Express Edition came out). It does "look something similar to" Visual Studio compared to other IDE's I've experimented with (including Eclipse CDT) when it comes to debugging step-through, step-in, etc (placing break points is a bit awkward because I don't like to use mouse too much when coding, but it's not difficult).
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