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Need integer consts eq long not short [message #3100]

Wed, 02 November 1994 12:32

sgs
Messages: 2
Registered: November 1994

Junior Member

I need pvwave to have long (4 byte) constant integers by default rather
than short (2 byte). Is there a way to force this behavior with a
system variable, or something?

Short integers cause problems like this:

for i=0,n do begin ... ; buggy, i is a short integer
for i=0L,n do begin ... ; correct, i is a long integer

Pvwave creates i as a short integer, because the constant 0 is, by default,
short. However, when (long) n is bigger than 32767, the loop only loops
to (n mod 32767).

(1) Unfortunately, these loops often produce reasonable, but incorrect
answers.

Many of the std/* and user/* routines provided with pvwave have this
bug. (grep for lines with "for i=0", and any lines with integer
constants). (Watch out! They work with your small test case, but fail
with your real, large dataset, see (1).)

Steve Spray sgs@lmsc.lockheed.com

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[Message index]

		Need integer consts eq long not short By: sgs on Wed, 02 November 1994 12:32
		Re: Need integer consts eq long not short By: landers on Thu, 10 November 1994 06:33
		Re: Need integer consts eq long not short By: black on Wed, 09 November 1994 08:05

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