app.py

import streamlit as st

def calculator():
    st.title("Simple Calculator")

    num1 = st.number_input("Enter first number", value=0.0, format="%.2f")
    num2 = st.number_input("Enter second number", value=0.0, format="%.2f")

    operation = st.selectbox("Choose an operation", ["Addition", "Subtraction", "Multiplication", "Division"])

    if st.button("Calculate"):
        if operation == "Addition":
            result = num1 + num2
        elif operation == "Subtraction":
            result = num1 - num2
        elif operation == "Multiplication":
            result = num1 * num2
        elif operation == "Division":
            if num2 != 0:
                result = num1 / num2
            else:
                result = "Error! Division by zero."

        st.success(f"Result: {result}")

if __name__ == "__main__":
    calculator()