About

There are two different kinds of numbers in Elixir - integers and floats.

Integers are whole numbers.

integer = 3
# => 3

A few useful functions for working with integers can be found in the Integer module.

Integer.digits(123)
# => [1, 2, 3]

Big integers (but also floats) are usually formatted by separating every 3 digits into groups with an underscore.

1_000_000
# => 1000000

The maximum size of numbers in Elixir is only limited by the memory available on the system because Elixir uses arbitrary precision arithmetic.

Elixir also supports shortcut notations for entering binary, octal, and hexadecimal integers.

0b0100
# => 4

0o555
# => 365

0xFF
# => 255

Comparison

Integers and floats can be considered equal (==) if they have the same value. However, being different types, they are never strictly equal (===).

1 == 1.0
# => true

1 === 1.0
# => false

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Originally from Exercism elixir concepts