Maria McGrew - Carets - calculator

c8_calc.rb

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+puts "Let's crunch some numbers!"
+puts "---------------------------------"
+
+def operation
+  operator_hash = {"add" => '+', "+" => "+", "subtract" => "-" , "-" => "-", "multiply" => "*", "*" => "*", "divide" => "/", "/" => "/"}
+  print "Enter an operator: "
+  math_verb = gets.chomp.downcase
+  until operator_hash.has_key?(math_verb)
+    print "Enter an operator: "
+    math_verb = gets.chomp.downcase
+  end
+  return operator_hash[math_verb]
+end
+
+def num_input
+  print "Enter a number: "
+  number = Float(gets.chomp) rescue nil
+  until number.is_a?(Float) do
+    print "This is not a number. Please enter a number: "
+    number = Float(gets.chomp) rescue nil
+  end
+  return number
+end
+
+def calculation(num1, operation, num2)
+  case operation
+    when "+"
+      return num1 + num2
+    when "-"
+      return num1 - num2
+    when "*"
+      return num1 * num2
+    when "/"
+      if num2 == 0
+        puts "You can't divide by 0"
+      else
+        return num1 / num2
+      end
+  end
+end
+
+def final_calculation
+  num1 = num_input
+  mode = operation
+  num2 = num_input
+  total = calculation(num1, mode, num2)
+  puts "#{num1} #{mode} #{num2} = #{total}"
+end
+
+final_calculation