From a89e9397f9c046f196a1fd74ad6d55bde3af3ea8 Mon Sep 17 00:00:00 2001
From: elle-terch <lterchin@gmail.com>
Date: Wed, 8 Aug 2018 10:11:28 -0700
Subject: [PATCH] Create calculator.rb

---
 calculator.rb | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 calculator.rb

diff --git a/calculator.rb b/calculator.rb
new file mode 100644
index 0000000..37d27a3
--- /dev/null
+++ b/calculator.rb
@@ -0,0 +1,63 @@
+#Welcome user and accept numbers to be evaluated. Validate user input.
+puts "Welcome to the calculator program!"
+puts "You will need to enter two numbers to be evaluated."
+puts "Please enter the first."
+begin
+  number_1 = gets.chomp
+  number_1 = Float(number_1)
+  rescue
+    puts "There is an error with your number. Please make sure you're using numbers/decimals only and try again."
+  retry
+end
+
+puts "Please enter another number."
+begin
+  number_2 = gets.chomp
+  number_2 = Float(number_2)
+  rescue
+    puts "There is an error with your number. Please make sure you're using numbers/decimals only and try again."
+  retry
+end
+
+#create a method for each operator
+def add_two_numbers(first_number, second_number)
+    puts "#{first_number} + #{second_number} = #{first_number + second_number}"
+end
+
+def subtract_two_numbers(first_number, second_number)
+    puts "#{first_number} - #{second_number} = #{first_number - second_number}"
+end
+
+def multiply_two_numbers(first_number, second_number)
+    puts "#{first_number} * #{second_number} = #{first_number * second_number}"
+end
+
+def divide_two_numbers(first_number, second_number)
+  if second_number == 0
+    puts "#{first_number} / #{second_number} = According to Wikipedia, the result of any number divided by zero is undefined."
+  else
+    puts "#{first_number} / #{second_number} = #{first_number / second_number}"
+  end
+end
+
+#prompt the user to choose their operator
+puts "Choose your operator! Type the name or symbol from the list below:"
+puts "1. add (+)"
+puts "2. subtract (-)"
+puts "3. multiply (*)"
+puts "4. divide (/)"
+operator = gets.chomp
+
+#use the appropriate method to evaluate the values
+case operator
+  when "add", "+"
+    add_two_numbers(number_1, number_2)
+  when "subtract", "-"
+    subtract_two_numbers(number_1, number_2)
+  when "multiply", "*"
+    multiply_two_numbers(number_1, number_2)
+  when "divide", "/"
+    divide_two_numbers(number_1, number_2)
+  else
+    puts "I'm sorry. That is not a valid option."
+end