app.py

import streamlit as st

# Conversion functions
def celsius_to_fahrenheit(celsius):
    return (celsius * 9/5) + 32

def fahrenheit_to_celsius(fahrenheit):
    return (fahrenheit - 32) * 5/9

def celsius_to_kelvin(celsius):
    return celsius + 273.15

def kelvin_to_celsius(kelvin):
    return kelvin - 273.15

def fahrenheit_to_kelvin(fahrenheit):
    return celsius_to_kelvin(fahrenheit_to_celsius(fahrenheit))

def kelvin_to_fahrenheit(kelvin):
    return celsius_to_fahrenheit(kelvin_to_celsius(kelvin))

# Sidebar for navigation
st.sidebar.title("Navigation")
st.sidebar.info("Choose the conversion type and enter the temperature value in the input box below.")

# Main title
st.title("🌡️ Temperature Conversion App")

# Conversion options in sidebar
conversion_type = st.sidebar.radio(
    "Choose Conversion Type:",
    (
        "Celsius to Fahrenheit",
        "Fahrenheit to Celsius",
        "Celsius to Kelvin",
        "Kelvin to Celsius",
        "Fahrenheit to Kelvin",
        "Kelvin to Fahrenheit"
    )
)

# Layout: Use two columns for input and output
col1, col2 = st.columns(2)

with col1:
    st.header("Input")
    if conversion_type == "Celsius to Fahrenheit":
        celsius = st.number_input("Enter temperature in Celsius:", min_value=-273.15, step=0.1)
        if st.button("Convert"):
            fahrenheit = celsius_to_fahrenheit(celsius)
            with col2:
                st.header("Output")
                st.success(f"{celsius}°C = {fahrenheit:.2f}°F")
    elif conversion_type == "Fahrenheit to Celsius":
        fahrenheit = st.number_input("Enter temperature in Fahrenheit:", min_value=-459.67, step=0.1)
        if st.button("Convert"):
            celsius = fahrenheit_to_celsius(fahrenheit)
            with col2:
                st.header("Output")
                st.success(f"{fahrenheit}°F = {celsius:.2f}°C")
    elif conversion_type == "Celsius to Kelvin":
        celsius = st.number_input("Enter temperature in Celsius:", min_value=-273.15, step=0.1)
        if st.button("Convert"):
            kelvin = celsius_to_kelvin(celsius)
            with col2:
                st.header("Output")
                st.success(f"{celsius}°C = {kelvin:.2f} K")
    elif conversion_type == "Kelvin to Celsius":
        kelvin = st.number_input("Enter temperature in Kelvin:", min_value=0.0, step=0.1)
        if st.button("Convert"):
            celsius = kelvin_to_celsius(kelvin)
            with col2:
                st.header("Output")
                st.success(f"{kelvin} K = {celsius:.2f}°C")
    elif conversion_type == "Fahrenheit to Kelvin":
        fahrenheit = st.number_input("Enter temperature in Fahrenheit:", min_value=-459.67, step=0.1)
        if st.button("Convert"):
            kelvin = fahrenheit_to_kelvin(fahrenheit)
            with col2:
                st.header("Output")
                st.success(f"{fahrenheit}°F = {kelvin:.2f} K")
    elif conversion_type == "Kelvin to Fahrenheit":
        kelvin = st.number_input("Enter temperature in Kelvin:", min_value=0.0, step=0.1)
        if st.button("Convert"):
            fahrenheit = kelvin_to_fahrenheit(kelvin)
            with col2:
                st.header("Output")
                st.success(f"{kelvin} K = {fahrenheit:.2f}°F")

# Footer
st.sidebar.markdown("----")
st.sidebar.write("Developed by **Malik Shehram Khan**")
st.sidebar.markdown("🌐 Powered by [Streamlit](https://streamlit.io)")