import streamlit as st

# Title of the app
st.title("Simple Calculator Application")
st.subheader("Perform basic arithmetic operations: Addition, Subtraction, Multiplication, Division.")

# Operation selection
operation = st.selectbox(
    "Select an operation:",
    ["Addition", "Subtraction", "Multiplication", "Division"]
)

# Input fields for numbers
num1 = st.text_input("Enter the first number:")
num2 = st.text_input("Enter the second number:")

# Button to trigger calculation
if st.button("Calculate"):
    try:
        # Convert inputs to numbers
        num1 = float(num1)
        num2 = float(num2)

        # Perform calculation based on the selected operation
        if operation == "Addition":
            result = num1 + num2
            st.success(f"The result of {num1} + {num2} is: {result}")
        elif operation == "Subtraction":
            result = num1 - num2
            st.success(f"The result of {num1} - {num2} is: {result}")
        elif operation == "Multiplication":
            result = num1 * num2
            st.success(f"The result of {num1} * {num2} is: {result}")
        elif operation == "Division":
            if num2 != 0:
                result = num1 / num2
                st.success(f"The result of {num1} / {num2} is: {result}")
            else:
                st.error("Error: Division by zero is not allowed!")
    except ValueError:
        st.error("Invalid input! Please enter numeric values.")