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bms's scratchpad

by bms (Monk)
on Feb 06, 2012 at 16:22 UTC ( #952110=scratchpad: print w/replies, xml ) Need Help??

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[ovedpo15]: how fast and a good way to print error if more than one out of three variables are defined? for example if there are $a $b $c. I want that if for example $a and $b are defined - print error (also for $a and $c or $b and $c)
[ovedpo15]: its easy with three "if"s or one long "if" but is there a "nice" way :)

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