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PROGRAMMING BASICS

Loop Control Constructs
By: Apress Publishing
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    2012-03-28

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    Loop Control Constructs


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    In this eighth part of a nine-part article series on control flow structures in Perl, you'll learn how to modify expressions with "while" and how to create loop control constructs. This article is excerpted from chapter three of the book Beginning Perl, Second Edition, written by James Lee (Apress; ISBN: 159059391X).

    Expression Modifying

    As before, you can usewhileas a statement modifier. Following the pattern forif, here’s what you’d do withwhile:

    while ( condition ) { statement }

    becomes

    statement while condition;

    Similarly:

    until ( condition ) { statement }

    becomes

    statement until condition;

    Therefore, this loop:

    while (<STDIN>) {
    print "You entered: $_";
    }

    can be written as

    print "You entered: $_" while <STDIN>;

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