Lynn Trickey's Calculator

calculator.rb

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+#gets type of math user wants to perform
+puts "\nLet's do some simple Math!"
+print "What would you like me to do? "
+command = gets.chomp
+
+possible_commands = ["addition", "add", "+", "plus", "subtraction", "minus", "-", "subtract", "multiply", "times", "*", "x", "multiplication" , "division", "divide", "/"]
+
+#makes sure user entered a valid command
+until possible_commands.include?(command)
+  puts "That's not a valid math equation I can do!"
+  print "Please enter something such as add, +, subtraction, etc. "
+  command = gets.chomp
+end
+
+#gets two numbers, makes sure they are numbers
+print "The first number? "
+first_input = gets.chomp
+until first_input =~ /\d/
+  puts "Very amusing, please enter a number: "
+  first_input = gets.chomp
+end
+first_input = first_input.to_f
+
+print   "And the second number? "
+second_input = gets.chomp
+until second_input =~ /\d/
+  puts "Very amusing, please enter a number: "
+  second_input = gets.chomp
+end
+second_input = second_input.to_f
+
+#defines the methods this calculator can use!
+def calculate(first_number, second_number, type)
+  if type == "+"
+    puts first_number + second_number
+  elsif type == "-"
+    puts first_number - second_number
+  elsif type == "*"
+    puts first_number * second_number
+  elsif type == "/"
+    puts first_number / second_number
+  end
+end
+
+#runs the method based on the user's command,
+#puts out answer
+case command
+  when "addition", "add", "+", "plus"
+    calculate(first_input, second_input, "+")
+  when "subtraction", "minus", "-", "subtract"
+    calculate(first_input, second_input, "-")
+  when "multiply", "times", "*", "x", "multiplication"
+    calculate(first_input, second_input, "*")
+  when "division", "divide", "/"
+    calculate(first_input, second_input, "/")
+end

calculator_edit.rb

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+#gets type of math user wants to perform
+puts "\nLet's do some simple Math!"
+print "What would you like me to do? "
+command = gets.chomp.downcase
+
+possible_commands = ["addition", "add", "+", "plus", "subtraction", "minus", "-", "subtract", "multiply", "times", "*", "x", "multiplication" , "division", "divide", "/"]
+
+#makes sure user entered a valid command
+until possible_commands.include?(command)
+  puts "That's not a valid math equation I can do!"
+  print "Please enter something such as add, +, subtraction, etc. "
+  command = gets.chomp
+end
+
+#gets two numbers, makes sure they are numbers
+print "The first number? "
+first_input = gets.chomp
+until first_input =~ /\d/
+  puts "Very amusing, please enter a number: "
+  first_input = gets.chomp
+end
+first_input = first_input.to_f
+
+print   "And the second number? "
+second_input = gets.chomp
+until second_input =~ /\d/
+  puts "Very amusing, please enter a number: "
+  second_input = gets.chomp
+end
+second_input = second_input.to_f
+
+#defines the methods this calculator can use!
+def calculate(first_number, second_number, type)
+  if type == "+"
+    puts first_number + second_number
+  elsif type == "-"
+    puts first_number - second_number
+  elsif type == "*"
+    puts first_number * second_number
+  elsif type == "/"
+    puts first_number / second_number
+  end
+end
+
+#runs the method based on the user's command,
+#puts out answer
+case command
+  when "addition", "add", "+", "plus"
+    calculate(first_input, second_input, "+")
+  when "subtraction", "minus", "-", "subtract"
+    calculate(first_input, second_input, "-")
+  when "multiply", "times", "*", "x", "multiplication"
+    calculate(first_input, second_input, "*")
+  when "division", "divide", "/"
+    calculate(first_input, second_input, "/")
+end