9 Math & Numbers
puts 5
5
puts 5.76554
5.76554
puts -5.76554
-5.76554
puts 5 + 9
14
puts 2 ** 3
8
puts 10 % 3
1
num = 20
puts ("my fav num " + num)
puts ("my fav num " + num.to_s)
my fav num 20
num = -20
puts num.abs()
20
num = 20.487
puts num.round()
20
num = 20.687
puts num.round()
21
切り上げ ceil()
num = 20.1
puts num.ceil()
21
切り下げ floor()
num = 20.9
puts num.floor()
num = 20.9
puts Math.sqrt()
puts Math.sqrt(36)
6
puts Math.log(1)
0.0
puts 1 + 7
8
puts 1.0 + 7
8.0
puts 10 / 7
1