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28 The Perl Scripting Language in .NET Develop GS1-13 in .NET 28 The Perl Scripting Language




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1062 28 The Perl Scripting Language using .net vs 2010 todisplay ean13 in asp.net web,windows application Oracle's Java Following is the program us EAN 13 for .NET ing an array:. $ cat foreachb.pl @stooges = ("Mo", "Larry", "Curly"); foreach (@stooges) { say "$_ says hello."; }.

Following is the program us EAN 13 for .NET ing the foreach postfix syntax:. $ cat foreachc.pl @stooges = ("Mo", "Larry", "Curly"); say "$_ says hello." foreach @stooges;.

The loop variable ($item an ean13+5 for .NET d $_ in the preceding examples) references the elements in the list within the parentheses. When you modify the loop variable, you modify the element in the list.

The uc function returns an upshifted version of its argument. The next example shows that modifying the loop variable $stooge modifies the @stooges array:. $ cat foreachd.pl @stooges = ("Mo", "Larry", "Curly"); foreach $stooge (@stooges) { $stooge = uc $stooge; say "$stooge says hello."; } say "$stooges[1] is uppercase" $ perl foreachd.

pl MO says hello. LARRY says hello. CURLY says hello.

LARRY is uppercase. See page 1069 for an example that loops through command-line arguments. last and next Perl s last and next statem European Article Number 13 for .NET ents allow you to interrupt a loop; they are analogous to the Bourne Again Shell s break and continue statements (page 976). The last statement transfers control to the statement following the block of statements controlled by the loop structure, terminating execution of the loop.

The next statement transfers control to the end of the block of statements, which continues execution of the loop with the next iteration. In the following program, the if structure tests whether $item is equal to the string two; if it is, the structure executes the next command, which skips the say statement and continues with the next iteration of the loop. If you replaced next with last, Perl would exit from the loop and not display three.

See use feature "say" on page 1047 if this program complains about say not being available.. Control Structures 1063 $ cat foreach1.pl foreach $ Visual Studio .NET EAN/UCC-13 item ("one", "two", "three") { if ($item eq "two") { next; } say "$item"; } $ perl foreach1.

pl one three. foreach: Syntax 2 The second syntax for the foreach structure is similar to the C for structure: foreach for (expr1; expr2; expr3) { ...

} The expr1 initializes the foreach loop; Perl evaluates expr1 one time, before it executes the block of statements. The expr2 is the termination condition; Perl evaluates it before each pass through the block of statements and executes the block of statements if expr2 evaluates as true. Perl evaluates expr3 after each pass through the block of statements it typically increments a variable that is part of expr2.

In the next example, the foreach2.pl program prompts for three numbers; displays the first number; repeatedly increments this number by the second number, displaying each result until the result would be greater than the third number; and quits. See page 1066 for a discussion of the magic file handle (<>).

. $ cat ./foreach2.pl #!/usr/ .

NET EAN/UCC-13 bin/perl -w print "Enter starting number: "; $start = <>; print "Enter ending number: "; $end = <>; print "Enter increment: "; $incr = <>; if ($start >= $end . $incr < 1) { die ("The starting number must be less than the ending number\n", "and the increment must be greater than zero.\n"); } foreach ($count = $start+0; $count <= $end; $count += $incr) { say "$count"; }. 1064 28 The Perl Scripting Language $ ./foreach2.pl Enter start ing number: 2 Enter ending number: 10 Enter increment: 3 2 5 8.

After prompting for three n EAN/UCC-13 for .NET umbers, the preceding program tests whether the starting number is greater than or equal to the ending number or if the increment is less than 1. The .

is a Boolean OR operator; the expression within the parentheses following if evaluates to true if either the expression before or the expression after this operator evaluates to true. The foreach statement begins by assigning the value of $start+0 to $count. Adding 0 (zero) to the string $start forces Perl to work in a numeric context, removing the trailing NEWLINE when it performs the assignment.

Without this fix, the program would display an extra NEWLINE following the first number it displayed..
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