Condition False even though True

Lightfoot

Something is acting fishy. The condition I have is not registering as true even though it is.

repeat
    CLK.Set(19, 32, 50) 'Set clock, 19:00 hours, 32 minutes past 19:00, 50 seconds
    currentHr := CLK.CurrentHour
    currentMin := CLK.CurrentMinute
    if currentHr >= 19 and currentHr <= 19 and currentMin >= 32 and currentMin <= 34
      outa[noparse][[/noparse]16]~~
    else
      outa[noparse][[/noparse]16]~

The current hour (currentHr) of the clock is 19 and outa[noparse][[/noparse]16] should go high when the clock hits 19:33. It does not.

What is up?

The application is a lights timer.

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kuroneko

if currentHr >= 19 and currentHr <= 19 and currentMin >= 32 and currentMin <= 34

SPIN can be a bit awkward sometimes. Replace >= with => (the former is an assignment, the latter the comparison) and <= with =<.

Post Edited (kuroneko) : 6/13/2010 12:10:05 AM GMT

tmaynard

kuoneko said...
SPIN can be a bit awkward sometimes. Replace >= with => (the former is an assignment, the latter the comparison) and <= with =<.

I stumbled over these until I saw the pattern: the "=" on the right is always an assignment operator. Think +=, -=, and /= ... all have equals on the right, all are assignment operators common in many languages.

At first Spin's assignment operators just seemed weird, but now they make perfect sense. You just have to see the pattern. They're the logical extension of already familiar operators.

Tom.

RossH

... and some people say C is obscure !!!

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