Converting Celsius to Fahrenheit

   
 
using System;
using System.Data;
using System.Text.RegularExpressions;

class Class1{
        static void Main(string[] args){
            Console.WriteLine(CtoF(0));      
            Console.WriteLine(CtoF(40));      
            Console.WriteLine(CtoF(50));      
            Console.WriteLine(CtoF(-50));
        }
    public static double CtoF(double celsius)
    {
      return (((0.9/0.5) * celsius) + 32);
    }
}