... 255characters in length. Upper- and lowercase letters are distinct. Variable names that begin with a digit can onlycontain digits, and variable names that begin with a character other than an alphanumeric ... (1 of 8) [2/7/2001 10: 28: 52 PM]Chapter 4The Perl Language 4.2 Data Types and Variables Perl has three basic data types: scalars, arrays, and hashes.Scalars are essentially simple variables. ... scalarvariable, an array, or a hash (or, for that matter, a filehandle, a subroutine name, or a label). This means that $fooand @foo are two different variables. It also means that $foo[1] is an...