import streamlit as st

st.set_page_config(page_title="Simple Calculator", layout="centered")

st.title("🧮 Simple Calculator")

# User input
num1 = st.number_input("Enter the first number", value=0.0)
num2 = st.number_input("Enter the second number", value=0.0)
operation = st.selectbox("Select operation", ["Addition (+)", "Subtraction (-)", "Multiplication (*)", "Division (/)"])

# Calculate result
def calculate(n1, n2, op):
    if op == "Addition (+)":
        return n1 + n2
    elif op == "Subtraction (-)":
        return n1 - n2
    elif op == "Multiplication (*)":
        return n1 * n2
    elif op == "Division (/)":
        if n2 != 0:
            return n1 / n2
        else:
            return "Error: Division by zero"

# Show result
if st.button("Calculate"):
    result = calculate(num1, num2, operation)
    st.success(f"Result: {result}")