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  Tutorial: Perl and CGI Introduction to Perl and CGI Comparisons in Perl Tutorial

Learn how to use simple comparisons and regular expressions in Perl.

Tutorial Details:

This tutorial shows how to use simple comparisons and regular expressions in Perl. Almost everything we put in an ?if? expression is going to be comparing a variable with a value, or a variable with another variable. In Perl, we have to keep our numeric comparisons separate from our text comparisons. The main reason for this is that Perl can?t know whether we want it to do a numeric or text comparison tell it what we want. Depending on context, ?1.0? could be just the number, or it could be the text string ?1?, ?.?, and ?0?.

Simple Comparisons
There are four major comparison operators: equals, does not equal, greater than, and less than. There are also the combinations, ?less than or equal to? and ?greater than or equal to?.
You can use any of these in ?if? or ?while? statements just as you have been using the ?eq? and ?==? in those statements.

You?ll notice yet another form of the ?if? statement used heavily in this program. The expression comparison ? value one : value two returns value one if the comparison is true, and value two if the comparison is not true.


 

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Perl and CGI Introduction to Perl and CGI Comparisons in Perl Tutorial

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