perl学习
#!/usr/bin/perl #In order to make the code more robust,to start every program with the following lines use strict; use warnings; #basic syntax over print "Hello,world/n"; print 'hello,world/n'; print 73; print("/nhello,world/n"); #perl variable types #Scalars my $name = "renbing"; my $age = 22; print "my name is $name,my age is $age./n"; #arrays my @animals = ("camel","llama","owl"); my @numbers = (23,22,66); my @mixed = ("camel",43,1.332); print $animals[0]; #the special variable $#array tells you the index of the last element of an array; #$#array +1 to tell you how many items there are in an array print $mixed[$#mixed]; print "/n"; print @numbers[1,2]; print "/n"; print @numbers[0..$#numbers]; #hashes #my %fruit_color = ("apple","red","banana","yellow"); my %fruit_color = ( apple => "red", banana => "yellow", ); print "/n"; print $fruit_color{"apple"}; my @fruits = keys %fruit_color; my @colors = values %fruit_color; print "/n"; #key string comparison? # eq ne lt gt le ge #file and i/o open(my $in,"<","input.txt") or die "can't open" (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |