unless|until|LABEL|{}|last|next|redo| || |//|i++|++i

Posted 2022-03-02 yuanjingnan

  1 #!/usr/bin/perl
  2 
  3 use strict;
  4 use warnings;
  5 
  6 $_ = ‘oireqo````‘;
  7 
  8 unless($_ =~ /^a/m)print "no match to a\n"
  9 
 10 #no match to a
 11 
 12 if(!($_ =~ /^a/m))print "no match to a\n"
 13 
 14 #no match to a
 15 
 16 unless($_ =~ /^o/m)print "no match to a"elseprint "match!\n"
 17 
 18 my $number = 1;
 19 
 20 while($number<12)
 21 
 22     $number++;print "$number\n";
 23 
 24 
 25 #2
 26 #3
 27 #4
 28 #5
 29 #6
 30 #7
 31 #8
 32 #9
 33 #10
 34 #11
 35 #12
 36 
 37 until($number<2)
 38 
 39     $number--;print "$number\n"
 40 
 41 
 42 #11
 43 #10
 44 #9
 45 #8
 46 #7
 47 #6
 48 #5
 49 #4
 50 #3
 51 #2
 52 #1
 53 
 54 print "match!\n"if($_ =~ /^o/m);
 55 
 56 #match!
 57 
 58 my @arr=(1,2,3,4,5,6,7);print foreach(@arr);print"\n";
 59 
 60 #1234567
 61 
 62 #my @arr_1=(1,2,3,4,5,6,7);print"$k" foreach my $k($#arr_1);print"\n";
 63 #Global symbol "$k" requires explicit package name (did you forget to declare "my $k"?) at t.pl line 62.
 64 #syntax error at t.pl line 62, near "$k("
 65 #Execution of t.pl aborted due to compilation errors.
 66 
 67 
 68     my $k = "good";
 69 
 70 #print "$k\n";
 71 
 72 #Global symbol "$k" requires explicit package name (did you forget to declare "my $k"?) at t.pl line 70.
 73 #Execution of t.pl aborted due to compilation errors.
 74 
 75 my @fruit = (‘apple‘,‘banana‘,‘peach‘,‘apple‘,‘apple‘);my %match;$match$_++ foreach(@fruit);print "$match$_\n"foreach(keys %match);
 76 
 77 #1
 78 #1
 79 #3
 80 
 81 my $five_1= 5;my $six_1 = $five_1++;print "$six_1\t$five_1\n";
 82 my $five_2= 5;my $six_2 = ++$five_2;print "$six_2\t$five_2\n";
 83 
 84 #5       6
 85 #6       6
 86 
 87 my %seen;foreach(@fruit) print "i ‘ve get $_!\n" if $seen$_++;
 88 
 89 #i ‘ve get apple!
 90 #i ‘ve get apple!
 91 
 92 for($_ = "abcdefg";s/(.)//;)print "$1\n";if($1 eq "f")last;
 93 
 94 #a
 95 #b
 96 #c
 97 #d
 98 #e
 99 #f
100 my %seen;
101 
102 READ:while(<>)
103 
104     foreach(split)
105     
106         next READ if /\W/;$seen$_++;
107     
108 
109 
110 foreach (keys %seen)print "last:$_ is $seen$_\n";last if /dewm/;
111 foreach (keys %seen)print "next:$_ is $seen$_\n";next if /dewm/;
112 #foreach (keys %seen)print "redo:$_ is $seen$_\n";redo if /dewm/;
113 
114 # cat 1.txt
115 # shsjsk   123
116 # dewm
117 # shsjsk   123
118 #  shsjsk   123
119 #  shsjsk   123
120 # cat 1.txt |perl t.pl
121 #last:shsjsk is 4
122 #next:shsjsk is 4
123 #next:123 is 4
124 #next:dewm is 1
125 #redo:dewm is 1
126 #……
127 
128 my $zero = 0;my $one = 1;
129 if (($zero != 0)&&($one%$zero==2))print "get!\n"
130 
131 #
132 
133 my %zoo;$zoo‘fish‘=‘cat‘,$zoo‘mouse‘ =‘dog‘;$zoo‘dog‘="";
134 my $animal=$zoo‘dog‘||‘nobody‘;print "$animal\n"; 
135 my $animal_1=$zoo‘panda‘||‘nobody‘;print "$animal_1\n";
136 my $animal_2=defined $zoo‘dog‘? ‘1‘:‘nobody‘;print "$animal_2\n"; 
137 my $animal_3=$zoo‘dog‘//‘nobody‘;print "$animal_3\n"; 
138 
139 #nobody
140 #nobody
141 #1
142 #
143 
144 printf "%s\n",$animal_3//‘nobody‘;
145 
146 #
147 
148 my $m =12;($m>20)||print "$m\n";
149 
150 #12
151 
152 $m>20 or die "wrong judgement";
153 
154 #wrong judgement at t.pl line 152, <> line 5.