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#if elsif else 条件语句 $i = <STDIN> ; chomp $i ; if($i < 10){ print "Number is less than 10" ; } elsif($i > 20){ print "Number is more than 20" ; } else{ print "Number is between 10 and 20." ; } #循环语句 $counter = 0 ; while($counter < 5){ print "counter is $counter, " ; print "$counter 小于5,进行循环\n" ; $counter++ } #for 循环 $i = 5 ; for(;$i >2;){ print "i is $i\n" ; $i-- } $i = 5 ; for(;$i>2;$i--){ print "is now is $i \n" ; }转载地址:http://ezjci.baihongyu.com/