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From: "Jeffrey R. Carter" <jrcarter@acm.org>
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Subject: Re: Topological Sort Help
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isaac2004 wrote:
> the topological sort that i am trying to accomplish from this
> structure will follow the algorithm that i have created from
> others(its pretty much the same) the problem is im having trouble
> setting up the while loop to traverse the array of digraph information

An easy way to avoid confusing while loops is not to use them. Instead of

Name : while Unintuitive_Negative_Logic_For_Loop_Continuation loop

use

Name : loop
    exit Name when Intuitive_Positive_Logic_For_Loop_Exit;

While loops, with their continuation condition, are generally better if 
you're doing correctness proofs, but if you're not, using exit 
conditions is usually clearer and more intuitive.

-- 
Jeff Carter
"What I wouldn't give for a large sock with horse manure in it."
Annie Hall
42