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<What arrays and pointers have in common - or - Why arrays start at zero ⁄ >




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Every now and again someone asks why do array indexes start at zero rather than one? It's a good question, because the 1st item in the array is...well..the 1st, not the 0th. Although the answer is easily found on the web, I figured it would tie in nicely with where we left off last time - looking at memory in .NET. Not surprisingly this stems from the good old C days (and perhaps even earlier). You see, back then, arrays and pointers were highly related. I actually remember thinking of them as identical things with different syntax. Once you see that arrays are just syntactical sugar to pointers, you'll understand why everything starts at zero. I'm not sure how much of this still applies in modern languages. I assume that arrays and pointers are still closely correlated - but I'm pretty sure zero now sticks around for convention. Everything below is in C.



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http://codebetter.com/blogs/karlseguin/archive/2008/05/06/what-arrays-...




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