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Perl loops are the while, do-until, for, and foreach loops. The while loop is the more general-purpose loop, whereas the for and foreach loops provide special capabilities. The foreach is particularly helpful in processing lists and arrays. The while, do-until, and for loops operate much like their counterparts in the C programming language. The for loop, in particular, has the same three expression formats as the C for loop. The foreach loop is similar to its counterpart in the C shell, able to easily handle lists of items. You can easily adapt the while loop for use with arrays. The variable used to control a loop can also be used, inside the loop, to index an array. In the next example, the elements of the title array are assigned the value of each title. Then, the contents of each element are printed out using a for loop. Notice that the $#num holds the count of elements in the array. $#num is used as the upper bound in the for loop test expression in order to check when the loop should stop.
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titlearr.pl #!/usr/bin/perl # Program to define and print out a scalar array @title = ( "Tempest", "Iliad", "Raven"); # define array with 3 elements for($i = 0; $i <= $#title; $i++) # Loop through array, $#title is size { print "$title[$i] \n"; # Print an element of the title array } $ titlearr.pl Tempest Iliad Raven
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The foreach loop is useful for managing arrays. In the foreach loop, you can use the array name to generate a list of all the element values in the array. This generated list of values then becomes the list referenced by the foreach loop. You can also specify a range of array elements, using only those values for the list, or a set of individual elements. In the next example, the array name @mylist is used to generate a list of its values that the foreach loop can operate on, assigning each one to $mynum in turn:
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mynumlist.pl #!/usr/bin/perl # Program to use foreach to print out an array @mylist = ( 34, 21, 96, 85); # define array of 4 elements foreach $mynum ( @mylist ) # Assign value of each element to $mynum { print "$mynum \n"; }
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Using the @ARGV array, you can specify the command line arguments as a list of values. The arguments specified on the command line when the program was invoked become a list of values referenced by the foreach loop. The variable used in the foreach loop is set
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automatically to each argument value in sequence. The first time through the loop, the variable is set to the value of the first argument. The second time, it is set to the value of the second argument, and so on. Tip The number of arguments that a user actually enters on the command line can vary. The #ARGV variable will always hold the number of arguments that a user enters. This is the number of elements that are in the ARGV array. If you want to reference all the elements in the ARGV array using their indexes, you will need to know the number of elements, #ARGV. For example, to use the foreach loop to reference each element in the ARGV array, you would use the .. operator to generate a list of indexes. 0.. $#ARGV generates a list of numbers beginning with 0 through to the value of $#ARGV.
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Conditions: if, elsif, unless, and switch
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Perl supports if-else operations much as they are used in other programming languages. The if structure with its else and elsif components allows you to select alternative actions. You can use just the if command to choose one alternative, or combine that with else and elsif components to choose among several alternatives. The if structure has a test expression encased in parentheses followed by a block of statements. If the test is true, the statements in the block are performed. If not, the block is skipped. Unlike in other programming languages, only a block can follow the test, and any statements, even just one, must be encased with it. The following example tests to see if an open operation on a file was successful. If not, it will execute a die command to end the program. The NOT operator, !, will make the test true if open fails, thereby executing the die command.
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if (!(open (REPS, "< $filen"))) { die "Can't open $filen"; } else { print "Opened $filen successfully"; }
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