Branches - Amal

calculator.rb

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+# check user input to chcek if it contains only numbers 
+def check_number (number)
+    until number.match(/\A\d+\z/) 
+        puts "Invalid Operation.Please enter the number again"
+        number = gets.chomp
+    end 
+
+    number.to_i 
+end 
+
+# perform math operations based on user input 
+# display results to the user 
+
+def calculator 
+    valid_operations = ["add","+","subtract","-","multiply","*","divide","/"]
+
+    # ask user for math operations 
+    # check if operation is valid and if not ask for a new input 
+    puts "What is the math operation?"
+    operation = gets.chomp.strip.downcase 
+    until valid_operations.include?(operation)
+        puts "Please enter a valid operation"
+        operation = gets.chomp
+    end 
+
+
+    # ask user for numbers and input validation 
+    puts "What is the first number for the math operation?"
+    number_one = gets.chomp.strip
+    number_one = check_number(number_one)
+    puts "What is the seccond number for the math operation?"
+    number_two = gets.chomp.strip
+    number_two = check_number(number_two)
+
+    # use user input to do math operations  
+    if operation == "add" || operation == "+"
+        result = number_one + number_two 
+        operation = "+"
+    elsif operation == "subtract" || operation == "subtract"
+        result = number_one - number_two 
+        operation = "-"
+    elsif operation == "multiply" || operation == "*"
+        result = number_one * number_two 
+        operation = "*"
+    elsif operation == "divide" || operation == "/"
+        result = number_one / number_two  
+        operation = "/"
+
+    end 
+
+
+    # display result of calculation to user 
+    puts " #{number_one} #{operation} #{number_two} = #{result}"
+end 
+
+
+
+calculator