beginner question about casting
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Thread: beginner question about casting

  1. #1
    Join Date
    May 2011
    Posts
    41

    beginner question about casting

    I am trying to make a program that converts a decimal into hexadecimal. It works in the sense that it returns the correct int's but how do I cast my int's that are between 10-15 to A-F as a string. Here is my code:
    Code:
    static void Main(string[] args)
            {
                Console.WriteLine("I will convert a number you input into Hexidecimal format.");
                Console.Write("Enter your number:");
                int yourNum = Int32.Parse(Console.ReadLine());
    
                int hexNum1, hexNum2, hexNum3, hexNum4, hexNum5;
    
                if (yourNum < 65535)
                {
                    hexNum1 = 0;
                }
                else 
                    hexNum1 = yourNum / 65535;
    
                int rem1 = yourNum % 65535;
    
                if (rem1 < 4096)
                {
                    hexNum2 = 0;
                }
                else
                    hexNum2 = rem1 / 4096;
    
                int rem2 = rem1 % 4096;
    
                if (rem2 < 256)
                {
                    hexNum3 = 0;
                }
                else
                    hexNum3 = rem2 / 256;
    
                int rem3 = rem2 % 256;
                if (rem3 < 16)
                {
                    hexNum4 = 0;
                }
                else
                    hexNum4 = rem3 / 16;
    
                int rem4 = rem3 % 16;
                if (rem4 < 1)
                {
                    hexNum5 = 0;
                }
                else
                    hexNum5 = rem4 / 1;
    
                switch (hexNum1)
                {
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                    case 8:
                    case 9:
                        hexNum1.ToString();
                        break;
                    case 10:
                        hexNum1.ToString();
                        break;
                    case 11:
                        hexNum1.ToString();
                        break;
                    case 12:
                        hexNum1.ToString();
                        break;
                    case 13:
                        hexNum1.ToString();
                        break;
                    case 14:
                        hexNum1.ToString();
                        break;
                    case 15:
                        hexNum1.ToString();
                        break;
                    default:
                        hexNum1.ToString();
                        break;
                }
    
                switch (hexNum2)
                {
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                    case 8:
                    case 9:
                        hexNum2.ToString();
                        break;
                    case 10:
                        hexNum2.ToString();
                        break;
                    case 11:
                        hexNum2.ToString();
                        break;
                    case 12:
                        hexNum2.ToString();
                        break;
                    case 13:
                        hexNum2.ToString();
                        break;
                    case 14:
                        hexNum2.ToString();
                        break;
                    case 15:
                        hexNum2.ToString();
                        break;
                    default:
                        hexNum2.ToString();
                        break;
                }
    
               
                switch (hexNum3)
                {            
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                    case 8:
                    case 9:
                        hexNum3.ToString();
                        break;
                    case 10:
                        hexNum3.ToString();
                        break;
                    case 11:
                        hexNum3.ToString();
                        break;
                    case 12:
                        hexNum3.ToString();
                        break;
                   
                    case 13:
                        hexNum3.ToString();
                         
                        break;
                    case 14:
                        hexNum3.ToString();
                        break;
                    case 15:
                        hexNum3.ToString();
                        break;
                    default:
                        hexNum3.ToString();
                        break;
                        
                }
                
    
    
                switch (hexNum4)
                {
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                    case 8:
                    case 9:
                        hexNum4.ToString();
                        break;
                    case 10:
                        hexNum4.ToString();
                        break;
                    case 11:
                        hexNum4.ToString();
                        break;
                    case 12:
                        hexNum4.ToString();
                        break;
                    case 13:
                        hexNum4.ToString();
                        break;
                    case 14:
                        hexNum4.ToString();
                        break;
                    case 15:
                        hexNum4.ToString();
                        break;
                    default:
                        hexNum4.ToString();
                        break;
                }
    
                switch (hexNum5)
                {
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                    case 8:
                    case 9:
                        hexNum5.ToString();
                        break;
                    case 10:
                        hexNum5.ToString();
                        break;
                    case 11:
                        hexNum5.ToString();
                        break;
                    case 12:
                        hexNum5.ToString();
                        break;
                    case 13:
                        hexNum5.ToString();
                        break;
                    case 14:
                        hexNum5.ToString();
                        break;
                    case 15:
                        hexNum5.ToString();
                        break;
                    default:
                        hexNum5.ToString();
                        break;
                }
    
              
    
    
               Console.WriteLine("Your number in Hex is:{0}, {1}, {2}, {3}, {4}", hexNum1, hexNum2, hexNum3, hexNum4, hexNum5 );
               Console.ReadLine();
    
            }
        }
    }

  2. #2
    DataMiser is offline Super Moderator Power Poster
    Join Date
    Jul 2008
    Location
    WV
    Posts
    4,812

    Re: beginner question about casting

    Isn't there a Hex function in C#?
    I've never looked in C# but I know VB has one. I would think C# does as well.
    Always use [code][/code] tags when posting code.

  3. #3
    Join Date
    Jun 2008
    Posts
    2,477

    Re: beginner question about casting

    Well, the question is a bit erroneous as you cannot cast a string to an int at all; you can only convert it. Don't roll your own implementation here, just use the overload of int.Parse() that takes a NumberStyles argument; http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx

    Code:
    string hex = "0x01";
    int result = int.Parse( hex, NumebrStyles.AllowHexSpecifier );
    I don't know how you intend on representing decimal (fractional) numbers in hex. It is possible of course, but hex is almost always used to represent integers, so your request makes little sense.

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