# puts "Hello, World"

# print "你叫什麼名子？ \n >> "

# name = gets

# puts "你好，" + name

# name = "Sherly"

# age = 21

# puts name

# puts age

# 變數交換

x = 1

y = 2

a = x

x = y

y = a

# 多重指定變數

x, y, z = 1, 2, 3

x, y = y, x

# x = 2

# y = 1

puts x

puts y

puts 3.785 - 2 # 1.7850000000000001

puts 6 / 2 * (1 + 2) # 相同層級運算後，由左至右計算