TemperatureConversionsProgram

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TemperatureConversion
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Calculate button

            double input = Convert.ToDouble(textBox1.Text);

            if (checkBox1.Checked)
            {
                textBox2.Text = input.ToString();
                textBox3.Text = FahrenheitCelsius(input).ToString();
                textBox4.Text = FahrenheitKelvin(input).ToString();
                textBox5.Text = FahrenheitRankine(input).ToString();
               
            }

            if (checkBox2.Checked)
            {
                textBox2.Text = CelsiusFahrenheit(input).ToString();
                textBox3.Text = input.ToString();
                textBox4.Text = CelsiusKelvin(input).ToString();
                textBox5.Text = CelsiusRankine(input).ToString();

            }

            if (checkBox3.Checked)
            {
                textBox2.Text = KelvinFahrenheit(input).ToString();
                textBox3.Text = KelvinCelsius(input).ToString();
                textBox4.Text = input.ToString();
                textBox5.Text = KelvinRankine(input).ToString();
            }

            if (checkBox4.Checked)
            {
                textBox2.Text = RankineFahrenheit(input).ToString();
                textBox3.Text = RankineCelsius(input).ToString();
                textBox4.Text = RankineKelvin(input).ToString();
            }


   
        }

        public static double FahrenheitCelsius(double Fahrenheit)
        {

            double FahrenheitCelsius;
            FahrenheitCelsius = ((Fahrenheit - 32) * (5/9));
            Math.Round(FahrenheitCelsius, 2);
            return FahrenheitCelsius;
        }

        public static double FahrenheitKelvin(double Fahrenheit)
        {
            double FahrenheitKelvin;
            FahrenheitKelvin = ((Fahrenheit + 459.67) * (5/9));
            Math.Round(FahrenheitKelvin, 2);
            return FahrenheitKelvin;

        }

        public static double FahrenheitRankine(double Fahrenheit)
        {
            double FahrenheitRankine;
            FahrenheitRankine = Fahrenheit + 459.67;
            Math.Round(FahrenheitRankine, 2);
            return FahrenheitRankine;

        }

        public static double CelsiusFahrenheit(double Celsius)
        {
            double CelsiusFahrenheit;
            CelsiusFahrenheit = (Celsius * (9 / 5) + 32);
            Math.Round(CelsiusFahrenheit, 2);
            return CelsiusFahrenheit;
        }

        public static double CelsiusKelvin(double Celsius)
        {
            double CelsiusKelvin;
            CelsiusKelvin = (Celsius + 273.15);
            Math.Round(CelsiusKelvin, 2);
            return CelsiusKelvin;
        }

        public static double CelsiusRankine(double Celsius)
        {
            double CelsiusRankine;
            CelsiusRankine = ((Celsius + 273.15) * (9 / 5));
            Math.Round(CelsiusRankine, 2);
            return CelsiusRankine;
        }

        public static double KelvinFahrenheit(double Kelvin)
        {
            double KelvinFahrenheit;
            KelvinFahrenheit = (Kelvin * (9 / 5) - 459.67);
            Math.Round(KelvinFahrenheit, 2);
            return KelvinFahrenheit;
        }

        public static double KelvinCelsius(double Kelvin)
        {
            double KelvinCelsius;
            KelvinCelsius = (Kelvin - 273.15);
            Math.Round(KelvinCelsius, 2);
            return KelvinCelsius;
        }

        public static double KelvinRankine(double Kelvin)
        {
            double KelvinRankine;
            KelvinRankine = (Kelvin * (9 / 5));
            Math.Round(KelvinRankine, 2);
            return KelvinRankine;
        }

        public static double RankineFahrenheit(double Rankine)
        {
            double RankineFahrenheit;
            RankineFahrenheit = (Rankine - 459.67);
            Math.Round(RankineFahrenheit, 2);
            return RankineFahrenheit;
        }

        public static double RankineCelsius(double Rankine)
        {
            double RankineCelsius;
            RankineCelsius = ((Rankine - 491.67) * (5 / 9));
            Math.Round(RankineCelsius, 2);
            return RankineCelsius;
        }

        public static double RankineKelvin(double Rankine)
        {
            double RankineKelvin;
            RankineKelvin = (Rankine * (5/9));
            Math.Round(RankineKelvin, 2);
            return RankineKelvin;
        }
    }
}