Branches - Michaela

calculator.rb

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+# Define data structures
+operators = {
+  "add": "+",
+  "+": "+",
+  "subtract": "-",
+  "-": "-",
+  "multiply": "*",
+  "*": "*",
+  "divide": "/",
+  "/": "/",
+  "modulo": "%",
+  "%": "%",
+  "exponent": "**",
+  "^": "**"
+}
+
+# Method to print all valid operators
+def print_operators
+  puts "1. Add (+)"
+  puts "2. Subtract (-)"
+  puts "3. Multiply (*)"
+  puts "4. Divide (/)"
+  puts "5. Modulo (%)"
+  puts "6. Exponent (^)"
+  print "\nPlease choose an operator (name or symbol): "
+end
+
+# Method to keep requesting input until a valid operator is entered
+def error_message_operators(input, valid_input)
+  until valid_input.keys.include? input.to_sym
+    puts "Oops! Your input was invalid. Your options are:"
+    print_operators
+    input = gets.chomp
+  end
+  return input
+end
+
+# Method to keep requesting input until a number is entered
+def error_message_numbers(input)
+  while input == nil
+    puts "Oops! Your input was invalid. Please enter a number: "
+    input = Float(gets) rescue nil
+  end
+  return input
+end
+
+# Greet the user
+puts "Welcome to your handy dandy calculator! Which operator would you like to use?"
+print_operators
+
+# Check user-input operator for validity and store valid operator
+chosen_operator = gets.chomp.downcase
+chosen_operator = error_message_operators(chosen_operator, operators)
+
+print "\nPlease enter your first number: "
+
+# Check user-input numbers for validity and store valid numbers
+chosen_number_1 = Float(gets) rescue nil
+chosen_number_1 = error_message_numbers(chosen_number_1)
+
+print "\nPlease enter your second number: "
+
+chosen_number_2 = Float(gets) rescue nil
+chosen_number_2 = error_message_numbers(chosen_number_2)
+
+# Call the selected operator method with the user's selected number arguments
+# Store the resulting value as the answer
+# Note: operators are methods (send reads the given string as a method)
+answer = chosen_number_1.send(operators[:"#{chosen_operator}"], chosen_number_2)
+
+# Adjust answer appropriately if user is dividing by 0
+if operators[:"#{chosen_operator}"] == "/" && chosen_number_2 == 0
+  answer = "infinity"
+end
+
+# Print the resulting formula and outcome
+puts "#{chosen_number_1} #{operators[:"#{chosen_operator}"]} #{chosen_number_2} = #{answer}"
+puts "The answer is #{answer}!"
+
+puts "\nThank you for using the calculator!"