public static class TemperatureConverter
{
    public static double CelsiusToFahrenheit(string temperatureCelsius)
    {
        // Convert argument to double for calculations.
        double celsius = System.Double.Parse(temperatureCelsius);
 
        // Convert Celsius to Fahrenheit.
        double fahrenheit = (celsius * 9 / 5) + 32;
 
        return fahrenheit;
    }
 
    public static double FahrenheitToCelsius(string temperatureFahrenheit)
    {
        // Convert argument to double for calculations.
        double fahrenheit = System.Double.Parse(temperatureFahrenheit);
 
        // Convert Fahrenheit to Celsius.
        double celsius = (fahrenheit - 32) * 5 / 9;
 
        return celsius;
    }
}