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: Division by zero" return x / y

print("Simple Calculator") print("Select 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(f"Result: {add(num1, num2)}") elif choice == '2': print(f"Result: {subtract(num1, num2)}") elif choice == '3': print(f"Result: {multiply(num1, num2)}") elif choice == '4': print(f"Result: {divide(num1, num2)}") else: print("Invalid input")