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!" else: return x / y
print("Select operation:") print("1. Add") print("2. Subtract") print("3. Multiply") print("4. Divide")
while True: choice = input("Enter choice (1/2/3/4): ")
if choice in ('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))
break
else:
print("Invalid input")
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