perl 條件語句

1、????if????if??????????????????????if...else????if??????????else???else??????????????if...elsif...else????????if??????????elsif??????????else???unless????unless??????????????????????unless...else?????unless??????????else?

2、??unless...elsif..elsestatement??unless??????????elsif??????????else???switch????????Perl????????switch???????????????????Perl????Perl????????????????????True??False???????????????????????????????:?????0???0?““?list()?un

3、def?false??????true?true????!?not???false?Perl????????????????:??????????:???if...else??????????????Exp1????true????Exp2????????????Exp3???????????????????????Exp1Exp2:Exp3#!usrlocalbinperl$name=“????“$favite=10#???$stat