In perl, how can i find whether or not an input is a number or interger?

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In perl, how can i find whether or not an input is a number or interger?
I have never user perl but judging from other programmign languages, you should be able to see how many digits long the number is, and if the number is %26lt;= 10 and longer than 1 digit then it is a decimal. Do this for 1- however many digits long u plan on the number getting.
Reply:You'd use a piece of code that checks if the rounded version is equal to the orginal value. If it is then it's an interger:


if( $num == sprintf("%.0f", $num) )


{


...


}


This uses the sprintf function. %.0f = no numbers after the decimal point

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