By J.L. Peterson
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Additional resources for Computer Programs for Spelling Correction: An Experiment in Program Design
Like numbers, strings have a literal representation, which is the way you represent the string in a Perl program. Literal strings come in two different flavors: single-quoted string literals and 36 37 double-quoted string literals. 1. Single-Quoted String Literals A single-quoted string literal is a sequence of characters enclosed in single quotes. The single quotes are not part of the string itself but are there to let Perl identify the beginning and the ending of the string. Any character other than a single quote or a backslash between the quote marks (including newline characters, if the string continues onto successive lines) stands for itself inside a string.
This #! line is the least portable part of a Perl program because you'll need to find out what goes there for each machine. Fortunately, it's almost always /usr/bin/perl or /usr/local/bin/perl. If that's not it, you'll have to find where your system is hiding perl and use that path. /usr/bin/env perl If perl isn't in any of the directories in your search path, you might have to ask your local system administrator 30 31 or somebody using the same system as you. perl. If nothing else, it tells your maintenance programmer as soon as he or she gets ready to fix it that it's a Perl program.
Numbers Though a scalar is most often either a number or a string, it's useful to look at numbers and strings separately for the moment. We'll cover numbers first and then move on to strings. 1. 35x1025). [*] This means that there are no integer values internal to Perl. [ ] [*] A double-precision floating-point value is whatever the C compiler that compiled Perl used for a double declaration. While the size may vary from machine to machine, most modern systems use the IEEE-754 format, which suggests 15 digits of precision and a range of at least 1e-100 to 1e100.