import streamlit as st

# Function to perform the calculation
def calculate(operation, num1, num2):
    if operation == 'Addition':
        return num1 + num2
    elif operation == 'Subtraction':
        return num1 - num2
    elif operation == 'Multiplication':
        return num1 * num2
    elif operation == 'Division':
        if num2 != 0:
            return num1 / num2
        else:
            return 'Error: Division by zero'

# Streamlit app
def main():
    st.title("Simple Calculator")

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

    # Select operation
    operation = st.selectbox("Select operation", ['Addition', 'Subtraction', 'Multiplication', 'Division'])

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

if __name__ == "__main__":
    main()