Add, subtract, multiply, and divide two numbers.

Simple Calculator

while True:
	print("Options:")
	print("Enter 'add' to add two numbers")
	print("Enter 'subtract' to subtract two numbers")
	print("Enter 'multiply' to multiply two numbers")
	print("Enter 'divide' to divide two numbers")
	print("Enter 'quit' to end the program")
	user_input = input(":")
	if user_input == "quit":
		break
	elif user_input == "add":
		num1 = float(input("Enter a number: "))
		num2 = float(input("Enter another number: "))
		result = str(num1 + num2)
		print("The answer is " + result)
	elif user_input == "multiply":
		num1 = float(input("Enter a number: "))
		num2 = float(input("Enter another number: "))
		result = str(num1 * num2)
		print("The answer is " + result)
	elif user_input == "subtract":
		num1 = float(input("Enter a number: "))
		num2 = float(input("Enter another number: "))
		result = str(num1 - num2)
		print("The answer is " + result)
	elif user_input == "divide":
		num1 = float(input("Enter a number: "))
		num2 = float(input("Enter another number: "))
		result = str(num1 / num2)
		print("The answer is " + result)
	elif user_input != "add" or "subtract" or "mulitply" or "divide" or "quit":
		print("Please enter a valid option.")