Thread: Memory Allocation issues

  1. #1
    Registered User
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    Mar 2013

    Memory Allocation issues

    I'm trying to allocate memory for an array of pointers to structures with:
    struct onode *onodeArray[size] = (struct onode**)calloc(size,sizeof(struct onode*));
    size is a parameter of the function this command is in, and it's simple the size (number of rows) of the array. My problem is that I'm getting this message when I try to compile my code: error: variable-sized object may not be initialized

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > struct onode *onodeArray[size]

    struct onode **onodeArray
    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.

  3. #3
    Registered User
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    Jun 2005
    In addition to Salem's advice, if you want the code to compile then turn the "(struct onode **)" type conversion into "(struct onode *)". i.e. you have one two many asterixes.

    In C, it is best to remove the type conversion completely, as it is not required. If you need it then either you have forgotten to #include <stdlib.h> or you are using a C++ compiler (which does require the type conversion) OR both.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Buttercup, and read this, this, and this before posting again.

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