Homework PES - T

calculator.rb

# Funkce
def print_menu options
	options.each_with_index do |x, i| 
		puts "#{i+1}: #{x}" 
	end

	puts 'Dej sem moznost:'
end

def spocitej a, b, c, op, historie
	s = "#{a} #{op} #{b} = #{c}"
	puts s
	historie << s
	c
end

# Konfigurace
options = ['+', '-', '*', '/', 'Vymazat Mezivysledek', 'Zobrazit Historii', 'Vymazat Historii', 'Konec']
historie = []

# Program
puts 'Dej sem cislo:'
a = gets.to_f

begin
	puts "Mezivysledek: #{a}"

	print_menu options

	op = gets.to_i

	puts "Vybral jsi \"#{options[op-1]}\":"

	if (op >= 1) and (op <= 4)
		puts 'Dej sem cislo:'
		b = gets.to_f
	end

	case op.to_s
		when '1'
			c = a + b
			a = spocitej a, b, c, options[op-1], historie
		when '2'
			c = a - b
			a = spocitej a, b, c, options[op-1], historie
		when '5'
			a = 0
		when '6'
			historie.each_with_index { |e, i| puts "#{i+1}. #{e}" }
		when '7'
			historie.clear
		when '8'
			# noop
		else
			puts "Neznama operace \"#{op}\""
	end
end while op != 8