Branches - Diana Han

calculator.rb

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+#Calculator Assignment
+
+#created an array of all the possible operations
+operations_array = ["add", "+", "subtract", "-", "multiply", "*", "divide", "/"]
+
+#display a list of operations to the user
+puts "Please select from below types of operations: "
+puts "1. add (+)"
+puts "2. subtract (-)"
+puts "3. multiply (*)"
+puts "4. divide (/)"
+
+#give user an option to choose the type of operation
+operation = gets.chomp
+
+#check if input is valid by searching in the operations_array
+until operations_array.include?(operation)
+  puts "Please enter a valid input"
+  operation = gets.chomp
+end
+
+#a method to check if the input from the user is valid 
+def check_number
+  input = gets.chomp
+  until input =~ /\d/ 
+    puts "Enter a valid number"
+    input = gets.chomp
+  end
+  return input.to_f
+end
+
+#call the method on user input to verify for valid input
+puts "Enter your first number"
+num1 = check_number
+
+puts "Enter your second number"
+num2 = check_number
+
+#case when syntax that checks which operation to perform based on the value of the variable operation
+case operation
+  when "add", "+"
+    puts "#{num1 + num2}"
+  when "subtract", "-"
+    puts "#{num1 - num2}"
+  when "multiply", "*"
+    puts "#{num1 * num2}"
+  when "divide", "/" 
+    # puts "#{num1 / num2}"
+    if num2 == 0 
+      puts "infinity"
+    else
+      puts "#{num1 / num2}"
+    end
+end
+