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Author Topic:   testing if ?VoiceNumber is odd or even
cristian_vogel
Member 		posted 16 January 2008 09:47         Edit/Delete Message   Reply w/Quote
what would be a simple expression to test if a HotValue or parameter like ?VoiceNumber is odd or even?

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SSC
Administrator 		posted 16 January 2008 10:41         Edit/Delete Message   Reply w/Quote
?VoiceNumber is known at compile time so you could use the Smalltalk message 'even' which returns a boolean true or false, for example:

code:

?VoiceNumber even ifTrue: [!Evens] ifFalse: [!Odds]

To test the odd/evenness of a hot value (not known at compile time, so you have to use CapyTalk) you could test whether it is 0 in mod 2 arithmetic, for example:

code:

((!Formant rounded mod: 2) eq: 0)

When you count modulo 2, the sequence <0 1 2 3 4 5...> is <0 1 0 1 0 1...>, so the expression is true when !Formant is ODD (in CapyTalk 1 is true and 0 is false).

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