Time - Olga Patrakova

calculator.rb

@@ -0,0 +1,66 @@
+puts "Welcome to the Calculator program! Which operator would you like to use?"
+puts "1. add (+)
+2. subtract (-)
+3. multiply (*)
+4. divide (/)
+5. exponify (^)
+6. find a remainder from a division (%)"
+
+# Check if a valid operator is chosen
+command = gets.chomp.downcase
+until ["add", "+", "subtract", "-", "multiply", "*", "divide", "/", "remainder", "find a remainder", "%", "exponify", "^"].include?(command)
+  puts "Please tell me to add (+), subtract (-), multiply (*), divide (/), exponentiate (^) or find a remainder (%)!"
+  command = gets.chomp.downcase
+end
+
+# Check if user input is not a letter
+def input_check(number)
+  until number.match(/\A[-]?\d+(\.\d+)?\z/)
+    puts "Please enter a valid number "
+    number = gets.chomp
+  end
+  return number
+end
+
+puts "Please enter the first number "
+first_number = gets.chomp
+checked_first = input_check(first_number)
+
+puts "Please enter the second number "
+second_number = gets.chomp
+checked_second = input_check(second_number)
+
+# Convert a string to a float or an integer depending on the presence of "." 
+def int_or_float(num)
+  return num.include?(".") ? num.to_f : num.to_i
+end
+
+checked_first = int_or_float(checked_first)
+checked_second = int_or_float(checked_second)
+
+puts "Here is the result of the calculation."
+
+# Output the result depending on the chosen operation
+case command
+when "add", "+"
+  puts "#{checked_first} + #{checked_second} = #{checked_first + checked_second}"
+when "subtract", "-"
+  puts "#{checked_first} - #{checked_second} = #{checked_first - checked_second}"
+when "multiply", "*"
+  puts "#{checked_first} * #{checked_second} = #{checked_first * checked_second}"
+when "divide", "/"
+  # Handle the division by zero case
+  if checked_second != 0 && (checked_first % checked_second > 0)
+    puts "#{checked_first} / #{checked_second} = #{checked_first.to_f / checked_second}"
+  elsif checked_second == 0
+    puts "Error! Division by zero"
+  end
+when "exponify", "^"
+  # Show the process of exponentiation
+  print "#{checked_first} * " * (checked_second - 1)
+  puts "#{checked_first} = #{checked_first ** checked_second}"
+when "remainder", "find a remainder", "%"
+  puts "#{checked_first} % #{checked_second} = #{checked_first % checked_second}"
+else
+  puts "What do you want from me?!"
+end