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public class con
    {
        int num; char ch;
        float f;
        public void coversion()
        {
            Console.Write("\n\t\tEnter a number to convert : ");
            num = Convert.ToInt32(System.Console.ReadLine());
                Console.WriteLine("\t\tI -> convert from inches to centimeters.");
                Console.WriteLine("\t\tG -> convert from gallons to liters.");
                Console.WriteLine("\t\tM -> convert from mile to kilometer.");
                Console.WriteLine("\t\tP -> convert from pound to kilogram.");
                Console.Write("\n\t\tSelect conversion you want to do: ");
                ch = Convert.ToChar(System.Console.ReadLine());
                switch (ch)
                {
                    case 'I':
                        {
                            f = (float)num * (float)2.5400;
                            Console.WriteLine("\n\t\t{0} inches = {1} cm\n\n", num, f);
                            break;
                        }
                    case 'G':
                        {
                            char ch2;
                            Console.WriteLine("\t\tI=> imperial gallon");
                            Console.WriteLine("\t\tU=> US gallon");
                            Console.Write("\n\t\tWhich one you want to enter : ");
                            ch2 = Convert.ToChar(Console.ReadLine());
                            if (ch2 == 'I')
                            {
                                f = (float)num * (float)4.546;
                                Console.WriteLine("\n\t\t{0} imperial gallons = {1}  litr                                 es\n\n", num, f);
                            }
                            else if (ch2 == 'U')
                            {
                                f = (float)num * (float)3.785;
                                Console.WriteLine("\n\t\t{0} US gallons = {1} litres\n\n"                                 , num, f);
                            }
                            else
                            { Console.WriteLine("\t\tInvalid input!\n\n"); }
                            break;
                        }
                    case 'M':
                        {
                            f = (float)num * (float)1.609344;
                            Console.WriteLine("\n\t\t{0} miles = {1} Kilometers\n\n", num                              , f);
                            break;
                        }
                    case 'P':
                        {
                            f = (float)num / (float)2.2046;
                            Console.WriteLine("\n\t\t{0} lbs = {1} Kilograms\n\n", num, f                                               );
                            break;
                        }
                    default:
                        {
                            Console.WriteLine("\n\t\tInvalid input please try again!\n\n"                                              );
                            break;
                        }
                }
        }

}