笨方法学Ruby第二十一天

def add(a, b)
	puts "ADDING #{a} + #{b}"
	a + b
end

def subtract(a, b)
	puts "SUBTRACTING #{a} - #{b}"
	a - b
end

def multiply(a, b)
	puts "MULTIPLYING #{a} * #{b}"
	a * b
end

def divide(a, b)
	puts "DIVIDING #{a} / #{b}"
	a / b
end


puts "Let's do some math with just functions!"

age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)

puts "Age :#{age}, Height: #{height}, Weight: #{weight}, IQ: #{iq}"


# A puzzle for the extra credit, type it anyway.
puts "Here is a puzzle."

what = add(age, subtract(height, multiply(weight, divide(iq, 2))))

puts "That becomes: #{what}. Can you do it by hand?"

first = divide(iq, 2)
second = multiply(weight, first)
third = subtract(height, second)
fourth = add(age, third)
puts fourth

puts " 24 + 34 / 100 - 1023 = ?"
answer = subtract(add(24, divide(34, 100)), 1023)

puts "#{answer}"
LJZN

笨方法学Ruby第二十一天

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