Perl ABC

1. Perl
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Handling of numbers in Perl

I will explain how to handle numbers in Perl. Explains four arithmetic operations, trigonometric functions, base conversion, and handling of random numbers.

Numerical basics

• Numeric literals - Representation of numbers in source code
• Binary, octal, and hexadecimal numerical representations

Operators for numerical calculations

• 4 rules operation
• Find the power **
• Increment operator ++
• Decrement operator-

Numbers and strings

• Automatic conversion of numbers and strings
• Determine if the string represents an integer
• Judge whether it is a numerical value looks_like_number

Numerical values and errors

• Numerical values and errors
• Compare floating point
• Round off
• Extract the integer part int
• Round up the fractional part - ceil function
• Round down the fractional part - floor function

Mathematical functions

• Find the absolute value abs
• Find the positive square root sqrt

Trigonometric function

• Get pi
• Convert angles to radians
• Trigonometric functions
• Various trigonometric functions

Exponential function/logarithmic function

• Get the base Napier number e of the natural logarithm
• Find the logarithm

Base conversion

I will explain how to perform "base conversion" in Perl. Introduces how to "convert to decimal", "octal", "binary", and "convert to arbitrary base".

• How to do "base conversion" in Perl

Random numbers

I will explain how to generate "random numbers" in Perl.

• Generate random numbers

Calculation of large numbers of significant digits

You can use "Math::BigInt" to calculate integers with a large number of digits, and "Math::BigFloat" to calculate floating point numbers with a large number of significant digits.

See Math::BigInt Math::BigFloat for calculating large figures.