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Newcomers DBPro Corner / For / Next loop point

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Philip
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Posted: 6th Jul 2003 20:17
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I keep encountering C code as follows:


for (i = 0; i
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Philip
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Posted: 6th Jul 2003 20:19
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Oh lord. Its going to be one of those days. It seems the C squiggly brackets ruined the post above.

Ok the post should have read:

I keep encountering C code as follows:

for (i = 0; i < 5; i ++)
etc.

I assume the object of this is to stop the loop when i = 5.

If this was ported literally to DBP you might end up with
for i = 0 to i < 5
etc.

however, this just means the for/next loop continues forever. Try it and see. So instead, I think the correct DBP code is:

for i = 0 to 5

I am happy to stand corrected though.

Phil

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spooky
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Posted: 6th Jul 2003 20:51
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I think your example shows variable going from 0 to 4 (not 5).

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Philip
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Posted: 7th Jul 2003 18:42
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Really? I thought the test was whether the second condition is still true? Even in C?

Phil

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IanM
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Posted: 7th Jul 2003 21:41
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Yes, but it's testing for less than 5
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Philip
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Posted: 8th Jul 2003 20:27
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As I said in my original post. I stand... corrected!

LOL

Still, at least I now know for certain that the correct conversion DBP code is for i = 0 to 5.

Cheers guys

Phil

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IanM
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Posted: 8th Jul 2003 20:48
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Argh! No.

The C version will only execute the contents of the loop 5 times (0,1,2,3,4), not 6 times (0,1,2,3,4,5).

The correct version is:

for i = 0 to 4

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Philip
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Posted: 9th Jul 2003 18:27
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IanM, you win another virtual lunch hamper, as officially stolen by me from the park's guests!!

I'm much obliged to you. I keep forgetting the 0 first iteration!

Phil

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