Time - Sharon

calculator.rb

@@ -0,0 +1,67 @@
+# create a hash to store the operation and welcoming user
+puts "Welcome to Sharon's calculator Program! Please see below a list of operators you can choose from"
+accepted_operation = { "add" => "+", "subtract" => "-" , "multiply" => "*", "divide" => "/", "exponents" => "^" , "modulo" => "%" }
+
+# loop thru the operator hash in order to show user what the choices are
+i = 1
+accepted_operation.each do |key, value|
+    puts "#{i}. #{value} (#{key})" 
+    i += 1
+end
+
+# ask user for a math operation
+puts "Please chose one operator (either name or symbol)"
+operation = gets.chomp.downcase
+
+# test the operation that user input is valid or not
+until accepted_operation.values.include?(operation) || accepted_operation.keys.include?(operation.downcase)
+    puts "Invalid input! Please try again!"
+    operation = gets.chomp.downcase
+end
+
+# create method for checking if the user has input a valid integer number for the formular
+def num_check(user_input)
+   while (user_input != '0') && (user_input.to_i.to_s != user_input.strip && user_input.to_f.to_s != user_input.strip) do
+        puts "Invalid input, please enter an valid number!"
+        user_input = gets.chomp
+    end
+    return user_input.to_f
+end
+
+# ask user for the first number and check if it's valid
+puts "Now, please enter the first number for the calculation"
+
+num1 = gets.chomp
+# to return the new user input from the method
+num1 = num_check(num1)
+
+# ask user for the second number and check if it's vaild
+puts "Now, please enter the second number for the calculation"
+num2 = gets.chomp
+# to return the new user input from the method
+num2 = num_check(num2)
+
+# converting the opertaion user inputed from word to symbol
+if accepted_operation.keys.include?(operation.downcase) 
+  symbol = accepted_operation[operation]
+else 
+  symbol = operation
+end
+
+# showing the formula and answer depending on user's inputs
+puts "Here is your formula: #{num1} #{symbol} #{num2}"
+print "Your answer is: "
+case operation
+  when "add","+"
+    puts num1 + num2
+  when "subtract", "-"
+    puts num1- num2
+  when "multiply", "*"
+    puts num1 * num2
+  when  "divide", "/"
+    puts num1 / num2
+  when "exponents", "**"
+    puts num1 ** num2 
+  when "modulo","%" 
+    puts num1 % num2 
+end