import streamlit as st

st.title("🧮 Simple Calculator")

# Input fields
num1 = st.number_input("Enter first number:", format="%.2f")
operation = st.selectbox("Select operation:", ["Add", "Subtract", "Multiply", "Divide"])
num2 = st.number_input("Enter second number:", format="%.2f")

# Perform calculation
if st.button("Calculate"):
    try:
        if operation == "Add":
            result = num1 + num2
        elif operation == "Subtract":
            result = num1 - num2
        elif operation == "Multiply":
            result = num1 * num2
        elif operation == "Divide":
            if num2 != 0:
                result = num1 / num2
            else:
                st.error("Cannot divide by zero.")
                result = None

        if result is not None:
            st.success(f"Result: {result:.2f}")

    except Exception as e:
        st.error(f"An error occurred: {e}")