debugging

This is a discussion on debugging within the C++ Programming forums, part of the General Programming Boards category; Hello I've been programming for about 3-4 years and using MSVC 2005 at the moment. However, I havent used the ...

  1. #1
    l2u
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    debugging

    Hello

    I've been programming for about 3-4 years and using MSVC 2005 at the moment.
    However, I havent used the MSVC debugger until now because I didnt know how to use it..

    Are there any tutorials, any helpful/beginner tips?

    I would really like to learn how to use it.

    I used std::cout to print the data (to fix the bugs) and see the point that program reaches.

    Thanks a lot for help

    Regards

  2. #2
    Cat without Hat CornedBee's Avatar
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    If I remember correctly, I learned the debugger from a single chapter in my first book plus playing with it a lot. For an introduction, Google produces some info.

    http://ei.cs.vt.edu/~cs1205/c_debug/intro.html
    http://www.cs.iit.edu/~resource/supp.../vc_debug.html

    The two links may be for VC++6, but the basic functionality is the same as in later versions, only the UI may have changed a little.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
    and the hat of wrongness Salem's Avatar
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    > I used std::cout to print the data (to fix the bugs) and see the point that program reaches.
    When you next use this technique to find a bug, and subsequently fix it, add the bug back into the code and try and find it again using the debugger (knowing more about what you're looking for).

    Most of the time, it's just
    - breakpoints to halt the program
    - step, step into, step over to control the execution
    - watch variables, to replace your debugging 'cout' statements.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  4. #4
    l2u
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    How to recover memory leaks?

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    and the hat of wrongness Salem's Avatar
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    http://msdn2.microsoft.com/en-us/lib...e9(VS.80).aspx

    1. You enable this feature in your code.
    2. You run the program, and at the end you'll get a list of leaked blocks. Along with each block is an allocation number.
    3. The next time you run the program, you can use the allocation number to 'break' when that block is allocated once more. You then trace carefully to see who ultimately owns that block, and from that perhaps understand why they failed to free it.

    As with all things, practice on a small program which say calls malloc twice and free once.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    l2u
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    Thanks for help..
    Sorry, but how can I enable this feature in MSVC 2005?

  7. #7
    l2u
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    I found this website: http://msdn2.microsoft.com/en-us/lib...h3(VS.80).aspx
    Seems like it works!

    Thanks again.

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