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swilting

by swilting (Beadle)
on Jun 12, 2008 at 15:01 UTC ( #691673=user: 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)

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