import gradio as gr

def calculator(a, b, operation):
    if operation == "Add":
        return a + b
    elif operation == "Subtract":
        return a - b
    elif operation == "Multiply":
        return a * b
    elif operation == "Divide":
        return a / b if b != 0 else "Error: Division by zero"

with gr.Blocks() as demo:
    gr.Markdown("# 🧮 Simple Calculator")

    with gr.Row():
        a = gr.Number(label="First Number")
        b = gr.Number(label="Second Number")

    operation = gr.Radio(["Add", "Subtract", "Multiply", "Divide"], label="Operation")
    result = gr.Textbox(label="Result")

    btn = gr.Button("Calculate")
    btn.click(calculator, inputs=[a, b, operation], outputs=result)

demo.launch()