How to use assert?

This is a discussion on How to use assert? within the C Programming forums, part of the General Programming Boards category; I have this method: Code: void setvisible(Cell * C, int val) and i am asked to use assert to check ...

  1. #1
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    How to use assert?

    I have this method:
    Code:
    void setvisible(Cell * C, int val)
    and i am asked to use assert to check that val is between 1 and 9 inclusive.

    I wrote
    Code:
    assert( (val >= '1') && (val <= '9') );
    Can someone please let me know if this is right, and if so what it actually does.

    Thanks

  2. #2
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    that looks right -- but beweare because assert does nothing at all when the program is compiled for release mode.

  3. #3
    Frequently Quite Prolix dwks's Avatar
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    And you need <assert.h>.

    assert does nothing at all when the program is compiled for release mode.
    Or, rather, when NDEBUG is defined.
    dwk

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