Thread: How far does const go?

  1. #1
    Registered User
    Join Date
    Feb 2011
    Posts
    126

    How far does const go?

    Hi, everyone.

    I have written the following program, which compiles and runs on gcc/Ubuntu. Is it legal C?

    Code:
    int main()
    {
     const int a = 1;
     int* b = &a;
     *b = 2;
     return 0;
    }

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
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    Do you get this warning?

    warning: initialization discards qualifiers from pointer target type

    If you try to modify an object declared const, you're into undefined behaviour territory.
    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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