def calculator(num1, num2, operation):
if operation == "add":
return num1 + num2
elif operation == "subtract":
return num1 - num2
elif operation == "multiply":
return num1 * num2
elif operation == "divide":
if num2 != 0:
return num1 / num2
else:
return "Error: Division by zero!"
else:
return "Invalid operation!"
# Example usage:
print(calculator(10, 5, "add")) # ➝ 15
print(calculator(10, 5, "subtract")) # ➝ 5
print(calculator(10, 5, "multiply")) # ➝ 50
print(calculator(10, 5, "divide")) # ➝ 2.0
