import streamlit as st

st.title("Simple Calculator")

# Input fields
num1 = st.number_input("Enter first number", value=0.0)
num2 = st.number_input("Enter second number", value=0.0)

# Operation selection
operation = st.selectbox("Select operation", ["Addition (+)", "Subtraction (-)", "Multiplication (*)", "Division (/)"])

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

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