app.py

import streamlit as st

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

    # User inputs
    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("Select operation", ["Addition", "Subtraction", "Multiplication", "Division"])

    # Perform calculation
    result = None
    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:
            st.error("Division by zero is not allowed")

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

if __name__ == "__main__":
    main()