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return x * y def divide(x, y): if y == 0: return "Cannot divide by zero" return x / y while True: print("Options:") print("Enter 'add' for addition") print("Enter 'subtract' for subtraction") print("Enter 'multiply' for multiplication") print("Enter 'divide' for division") print("Enter 'quit' to end the program") user_input = input(": ") if user_input == "quit": break elif user_input in ("add", "subtract", "multiply", "divide"): num1 = float(input("Enter first number: ")) num2 = float(input("Enter second number: ")) if user_input == "add": print("Result:", add(num1, num2)) elif user_input == "subtract": print("Result:", subtract(num1, num2)) elif user_input == "multiply": print("Result:", multiply(num1, num2)) return False for i in range(2, int(n**0.5) + 1): if n % i == 0: return False return True num = int(input("Enter a number to check if it's prime: ")) if is_prime(num): print("Prime") else: print("Not prime")
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