while True:
    num1 = float(input("Enter The 1st Number: "))

    operator = input("Enter an Operator (+, -, *, /) or 'exit' to end: ")

    if operator.lower() == 'exit':

        print("exit")
        break
    
    if operator not in ['+', '-', '*', '/']:

        print(f"{operator} is not a valid Operator")
        continue

    num2 = float(input("Enter The 2nd Number: "))

    if operator == "+":

        result = num1 + num2

    elif operator == "-":

        result = num1 - num2

    elif operator == "*":

        result = num1 * num2

    elif operator == "/":

        if num2 != 0:

            result = num1 / num2

        else:

            print("Error")
            continue

    print("Result:", result)