import gradio as gr

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 "Error: Division by zero!"
        return num1 / num2
    else:
        return "Invalid operation"

app = gr.Interface(
    fn=calculator,
    inputs=[
        gr.Number(label="First Number"),
        gr.Number(label="Second Number"),
        gr.Dropdown(["Add", "Subtract", "Multiply", "Divide"], label="Operation")
    ],
    outputs=gr.Textbox(label="Result"),
    title="Simple Calculator",
    description="Enter two numbers and choose an operation."
)

if __name__ == "__main__":
    app.launch()