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    <p>The ability to treat a pointer as an array definitely confuses most C beginners. Arrays even <em>decay</em> to pointers when passed as arguments to functions, giving the impression that arrays and pointers are completely interchangeable -- they aren't. An excellent description is in <a href="http://rads.stackoverflow.com/amzn/click/0131774298" rel="nofollow">Expert C Programming: Deep C Secrets</a>. (This is one of my favorite books; it's strongly recommended if you intend to understand C.)</p> <p>Anyway, writing <code>pointer[2]</code> is the same as <code>*(pointer+2)</code> -- the array syntax is far easier for most people to read (and write).</p> <p>Since you are using this <code>*points</code> variable to provide easier access to another block of memory (the pointer <code>points</code> in the <code>struct Series</code>), you <em>cannot</em> use an array for your local variable because you cannot re-assign the base of an array to something else. Consider the following illegal code:</p> <pre><code>int foo[10]; int *bar; int wrong[10]; bar = foo; /* fine */ wrong = foo; /* compile error -- cannot assign to the array 'wrong' */ </code></pre> <p>Another option for re-writing this code is to remove the temporary variable:</p> <pre><code>if (src-&gt;lo &lt; src-&gt;hi) { self-&gt;points[0] = src-&gt;lo; self-&gt;points[1] = src-&gt;hi; self-&gt;count = 1; } </code></pre> <p>I'm not sure the temporary variable helps with legibility -- it just saved typing a few characters at the expense of adding a <em>lot</em> of characters. (And a confusing variable, too.)</p>
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    1. POBetter way of declaring an array?
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    1. COC isn't so intuitive to me. Think the book would be valuable to a beginner. I'm using Joy of C: Programming in C by Miller & Quilici
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    2. COI think _Expert C Programming_ is an excellent _second_ book. It'd be too much for a first book. I think the [second edition of The C Programming Language](http://en.wikipedia.org/wiki/The_C_Programming_Language) is probably the best first book. I'm not familiar with _The Joy Of C_, but the [description on the Wiley website](http://www.wiley.com/WileyCDA/WileyTitle/productCd-047112933X.html) sounds good enough, and Wiley is usually good for a good book.
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    3. COI received "Expert C Programming: Deep C Secrets." It looks interesting. The author has a sense of humor. Thanks for your advice.
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