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biotech as guest
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 Posted: Mon Jan 21, 2008 10:57 pm Post subject: divisiable by four? easy for gurus |
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i need to know is number divisable by four, if it is not what first greater one is?
this should be easy for serious programers, which i am not.
any hints?
thanks |
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ManaUser
Joined: 24 May 2007
Posts: 906
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| Posted: Mon Jan 21, 2008 11:23 pm Post subject: |
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| Code: | X := 15
If (Mod(X, 4) = 0)
MsgBox % X . " is divisible by four."
Else
{
Y := X + 4 - Mod(X, 4)
MsgBox % X . " is not divisible by four, but " . Y . " is."
} |
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dncarac
Joined: 31 Aug 2006
Posts: 64
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| Posted: Mon Jan 21, 2008 11:28 pm Post subject: |
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Bitwise exclusive-OR the number with 3, then check if the result is zero. If so, the number is divisible by four, if not, it is not.
To find the next higher number divisible-by-four, bitwise shift the original number right two bits then bitwise shift the result left by two bits. The result of that operation is the next higher number divisible-by-four.
There are other methods.
All of these operations are described in the documentation under "Variables and Expressions"
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