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Forum:
Visual FoxPro
Catégorie:
Autre
Titre:
Divers
Thread ID:
00260725
Message ID:
00261331
Vues:
35
>>Hi Jim,
>>
>>Funny you mention that this would bring VFP in-line with other languages. I* was swapping some private messages with Craig B. and mentioned that I'd like to see a post-test iteration structure and VFP not having one where other languages do. Might seem a bit silly since we can emulate one, but after reading your comments, maybe not so much so.
>
>I gotta ask, what is a post-test iteration structure?

Hi William,

No problem. There are three basic types of iteration (looping) structures: Fixed (FOR...ENDFOR); Pre-test (DO WHILE); and Post-Test DO...UNTIL. The difference between pre- and post-test is that pre-test will iterate (loop) zero or more times, post-test will iterate at least once. For example, DO WHILE NOT EOF() will not execute if the file is empty or you're already at EOF(). Basically, the difference is that a pre-test will evaluate the condition as the first line of the structure block, and post-test will evaluate it as the last line.
George

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