10 + 20 # 30
20 - 10 # 10
10 * 20 # 200
20 / 10 # 2
# power
10 ** 2 # 100
# automatic floating point conversion
10.0 + (10 + 20) # 40.0
20.0 - (10 + 10) # 0.0
10.0 * (10 * 2) # 200.0
# common division error
30 / 20 # 1
30.0 / 20.0 # 1.5
# modulo, remainder
12.5 % 10.0 # 2.5
10.0 % 20.0 # 10.0
# built in numerical operations
(-20).abs # 20
([1, 2, 3, 4]).min # 1
([1, 2, 3, 4]).max # 4
# rounding values
(2.945).round() # 3
(2.495).round() # 2
(2.945).round(2) # 2.95
'''
Michael Sjoeberg
2018-11-07
https://github.com/michaelsjoeberg/ruby-playground/blob/master/basic-syntax/arithmetic-operators.rb
'''