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QTIPS - FOR/NEXT variablesTony McDowell writes - "The documentation (page N4.73) states that "start", "end" and "step" must be integers. A little experimentation might suggest that in fact any decimal fractions can be used for these variables. Don't be fooled. If STEP is a decimal fraction then anomalous results can occur. Specifically, it seems that the "even-ness" of the bound and step variables is critical. My tests show that if step and the lower and upper bounds are "even" decimal fractions then the FOR/NEXT loop will incorrectly terminate when step is equal to "end" rather than when it exceeds "end" (or underflows if step is negative)." 0001 * This one is bad - it won't hit -2.0 0002 A = 2 ; B = -2 0003 For I = A To B Step -0.2 ; Call Msg("I = " : I) ; Next 0004 0005 * This one is OK 0006 A = 1 ; B = -1 0007 For I = A To B Step -0.2 ; Call Msg("I = " : I) ; Next 0008 0009 * This one OK 0010 A = 2 ; B = 4 0011 For I = A To B Step -0.5 ; Call Msg("I = " : I) ; Next 0012 0013 * This one is bad - it won't hit 4.0 0014 A = 2 ; B = 4 0015 For I = A To B Step -0.4 ; Call Msg("I = " : I) ; Next * NB Version 2.12 MSG used above! (Volume 4, Issue 2, Page 5) |
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