Re: Puzzling small piece of code - exception block essentially used as goto

["Jeffrey R. Carter" <spam.jrcarter.not@acm.nospam.org>]

Anonymous Coward wrote:
> 
> Tests show that this code actually loops a few times when run in a
> typical state.  What I would like clarification on is when the
> exception block ends, where is control returned to?

Control continues from the end of the block statement.

> Also, anyone up for the challenge of rewriting this without the
> exception handler so the rest of us humans can understand what it's
> doing?

Presumably the difficulty is evaluating the expression New_Hour - Hour. 
It may be impossible to determine which of the 3 calculations of 
Hour_Delta to use without evaluating the expression and seeing if it 
raises Constraint_Error. Or perhaps determining which of the 3 
calculations of Hour_Delta to use is more complex than this code. 
Without knowing the details of the types of the variables used, I can't say.

-- 
Jeff Carter
"Propose to an Englishman any principle, or any instrument, however
admirable, and you will observe that the whole effort of the English
mind is directed to find a difficulty, a defect, or an impossibility
in it. If you speak to him of a machine for peeling a potato, he will
pronounce it impossible: if you peel a potato with it before his eyes,
he will declare it useless, because it will not slice a pineapple."
Charles Babbage
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