Hmmm. that's interesting. Apparently my memory of 25 years of c coding is in error. From the FAQ you pointed me to:
/********* A reference to an object of type array-of-T which appears in an expression decays (with three exceptions) into a pointer to its first element; the type of the resultant pointer is pointer-to-T. That is, whenever an array appears in an expression, the compiler implicitly generates a pointer to the array's first element, just as if the programmer had written &a[0]. *********/ This is a truth. In multidimensional arrays, all but the lowest level array contain pointers to the beginning of the next level.. I wish I was better at ascii graphics, I could draw this out.. The compiler will generate access code that looks something like this for multidimensional array access: *(*(level1 + n) + n)... Try preprocessing to assembler and check out the resulting code. It is this that I was referring to. It also behooves me to remember that arrays in c are contiguous blocks of a type. That's all. They really don't have any more of a special meaning than that. When we are coding in c we are coding at a lower level that C#, or VB. We need to remember that, or we WILL get bitten with frustrating special features that creep into our programs. Michael _____ From: [email protected] [mailto:[email protected]] On Behalf Of Paul Herring Sent: Monday, May 11, 2009 10:57 PM To: [email protected] Subject: Re: [c-prog] Difference b/w pointer to pointer and 2D arrays On Tue, May 12, 2009 at 3:06 AM, Michael Comperchio <mcmp...@gmail. <mailto:mcmprch%40gmail.com> com> wrote: > A two dimensional array of characters.. > int myarray[10][10]; > > the first dimension is an array of 10 pointers, each pointing to the > beginning of an array of 10 integers. Um, no it's not. It may sometimes act like it, but there are no pointers there. You may find http://c-faq. <http://c-faq.com/aryptr/aryptr2.html> com/aryptr/aryptr2.html and http://c-faq. <http://c-faq.com/aryptr/aryptrequiv.html> com/aryptr/aryptrequiv.html somewhat educational. (And the rest of that FAQ come to think of it. -- PJH http://shabbleland. <http://shabbleland.myminicity.com/com> myminicity.com/com http://www.chavgang <http://www.chavgangs.com/register.php?referer=9375> s.com/register.php?referer=9375 [Non-text portions of this message have been removed]
