In this video, you'll learn about functions for working with numbers and math.
- [Voiceover] Perl has a full complement of numeric…and math functions.…In this lesson, I'll show you some of…the more common examples.…Here's a working copy of math.pl from Chapter 13…of the exercise files.…You notice if I run this, I get the result of 197,…which is a + b.…If I change this + to a -,…you'll notice I get -103.…Now, if I want the absolute value of that,…which would be a positive number whether…the argument is actually negative or positive,…then I could use abs, which is the absolute value function.…
Notice, I don't need parentheses here because…these are built in functions.…I run that and I get 103,…because that's the absolute value of -103.…Perl also includes a number of math and trig functions.…Here's just a couple.…We have the arctan2, which is actually really convenient…for calculating the value of pi.…So, I can have 1,1 and multiply that by four,…and I get the value of pi.…Or I can take a square root. That's another common one.…
sqrt of $a,…and that is 6.855, etc.…There's not a power function because…
Watch to learn the details of the Perl syntax, from variables, conditionals, loops, and data structures to regular expressions, functions, and references. A quick-start guide is included for experienced developers who want to get up and running with Perl 5 fast, and the entire course is recommended for both new and experienced programmers alike. Later chapters cover file handling and reusing code with Perl modules, plus Perl best coding practices.
- Understanding Perl's general syntax and the anatomy of a Perl script
- Writing statements and expressions
- Creating assignments
- Working with variables and strings
- Using data types effectively
- Defining logical flow with conditionals and loops
- Using special variables
- Using Perl operators
- Performing simple Perl programming tasks with expressions
- Matching data
- Defining and calling functions
- Using references
- Handling files in the file I/O
- Using built-in functions
- Reusing code with modules
- Coding with Perl best practices
Skill Level Intermediate
1. Setting Up
About Perl3m 36s
2. Quick Start
3. Basic Syntax
4. Values and Variables
7. Special Variables
9. Regular Expressions
11. References and Structures
12. File I/O
13. Built-In Functions
15. Best Practices
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