# Untitled

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```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 x / y
else:
return "Error! Division by zero."

def calculator():
print("Select operation:")
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'):
try:
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
except ValueError:
continue

if choice == '1':
print(f"{num1} + {num2} = {add(num1, num2)}")
elif choice == '2':
print(f"{num1} - {num2} = {subtract(num1, num2)}")
elif choice == '3':
print(f"{num1} * {num2} = {multiply(num1, num2)}")
elif choice == '4':
print(f"{num1} / {num2} = {divide(num1, num2)}")
else:
print("Invalid input! Please select a valid operation.")

next_calculation = input("Do you want to perform another calculation? (yes/no): ")
if next_calculation.lower() != 'yes':
break

if __name__ == "__main__":
calculator()
```