Thread: Debugging loops in Micosoft Visual C++ 2010 Express

  1. #1
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    Debugging loops in Micosoft Visual C++ 2010 Express

    Hi,

    I am debugging a for loop which is 100 iterations long.
    My program starts to struggle after 50th loop, so I need to take a look inside each step of the loop after 50th iteration.

    Currently the only way I know to skip through a loop iteration is to say 'run to cursor' just before end of the loop, so it skips one iteration then do it again so it will skip the second etc

    As you can appreciate this will take a very long time until I reach the 50th iteration.

    Is there a way to skip a user defined number of iterations and go to the one I need straight away???

    Thank you!

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    C++ Witch laserlight's Avatar
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    That depends on what the loop actually does... but logically, if you can skip the first 49 iterations and still get the same net effect, then you probably should do that even if you were not trying to debug for the 50th iteration (e.g., you use a formula instead of a loop).

    Why not post the loop and other necessary code?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    My friend just told me the answer:

    Place a breakpoint just before end of the loop,
    Right click on the breakpoint
    Choose 'Hit Count' option
    specify to break when hit count reaches 50.

    Works a treat!

    Thank you for your comment anyway.

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    You can also set a breakpoint with a condition, say, i==50. That would break at a specific time in a loop. Also handy.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
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    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    Thank you

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