# MicroPython Calculator

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    if y == 0:
        return "Error: Cannot divide by zero!"
    else:
        return x / y

def calculator():
    print("Welcome to MicroPython Calculator")
    print("Choose operation:")
    print("1. Add")
    print("2. Subtract")
    print("3. Multiply")
    print("4. Divide")
    
    choice = input("Enter choice (1/2/3/4): ")
    
    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))
    
    if choice == '1':
        print("Result:", add(num1, num2))
    elif choice == '2':
        print("Result:", subtract(num1, num2))
    elif choice == '3':
        print("Result:", multiply(num1, num2))
    elif choice == '4':
        print("Result:", divide(num1, num2))
    else:
        print("Invalid choice!")

# Main program
calculator()