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  4. How to zero-pad a number?

How to zero-pad a number?

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  • P PIEBALDconsult

    It's so good to know that the hard work of the developers of String.PadLeft[^] and Int32.ToString[^] is providing so much joy to so many, other than you. By the way, what language is that? It can't be C#, or did you also override the + operator? :omg:

    S Offline
    S Offline
    SortaCore
    wrote on last edited by
    #9

    I think I wrote it in one of those points in the week where I just couldn't think. X| Methinks I'll replace it tomorrow.

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    • P PIEBALDconsult

      And the second?

      Richard DeemingR Offline
      Richard DeemingR Offline
      Richard Deeming
      wrote on last edited by
      #10

      PIEBALDconsult wrote:

      And the second?

      Doesn't matter. The documentation clearly states, "When one or both operands are of type string...", so the type of the other operand is irrelevant.


      "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

      "These people looked deep within my soul and assigned me a number based on the order in which I joined" - Homer

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      • Richard DeemingR Richard Deeming

        PIEBALDconsult wrote:

        And the second?

        Doesn't matter. The documentation clearly states, "When one or both operands are of type string...", so the type of the other operand is irrelevant.


        "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

        B Offline
        B Offline
        Big Daddy Farang
        wrote on last edited by
        #11

        I missed that the first time also. :)

        BDF The internet makes dumb people dumber and clever people cleverer. -- PaulowniaK

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        • Richard DeemingR Richard Deeming

          PIEBALDconsult wrote:

          And the second?

          Doesn't matter. The documentation clearly states, "When one or both operands are of type string...", so the type of the other operand is irrelevant.


          "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

          P Offline
          P Offline
          PIEBALDconsult
          wrote on last edited by
          #12

          Where do you see that in the documentation? I don't even see + in the documentation. And what idiot thought that was a good idea? :wtf: Time to find a new language; this one's becoming VB. X| Edit: I finally found it; it's not documented with String; what a POS. :thumbsdown: I'm fairly sure that no self-respecting C# professional uses it that way.

          Richard DeemingR S 3 Replies Last reply
          0
          • P PIEBALDconsult

            Where do you see that in the documentation? I don't even see + in the documentation. And what idiot thought that was a good idea? :wtf: Time to find a new language; this one's becoming VB. X| Edit: I finally found it; it's not documented with String; what a POS. :thumbsdown: I'm fairly sure that no self-respecting C# professional uses it that way.

            Richard DeemingR Offline
            Richard DeemingR Offline
            Richard Deeming
            wrote on last edited by
            #13

            It's the link that I posted in my previous message: http://msdn.microsoft.com/en-GB/library/k1a63xkz.aspx[^]


            "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

            "These people looked deep within my soul and assigned me a number based on the order in which I joined" - Homer

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            • P PIEBALDconsult

              Where do you see that in the documentation? I don't even see + in the documentation. And what idiot thought that was a good idea? :wtf: Time to find a new language; this one's becoming VB. X| Edit: I finally found it; it's not documented with String; what a POS. :thumbsdown: I'm fairly sure that no self-respecting C# professional uses it that way.

              S Offline
              S Offline
              SortaCore
              wrote on last edited by
              #14

              PIEBALDconsult wrote:

              I'm fairly sure that no self-respecting C# professional uses it that way.

              Heh, I go for the shorter version. If it doesn't make sense with a mishmash of ints/strings I use brackets or ToString(). Like for:

              int i = 124, j = 253;
              string s = "JD" + i + j; // Could be two things and no one wants to look up operator precedence, so instead...
              string t = "JD" + (i + j);

              But yeah, usually I don't bother. Although, theoretically, I could now do

              string s = 0; // won't initialise
              string t = "" + 0; // will work fine O.o

              So, let's get back to self-respecting... :rolleyes:

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              • P PIEBALDconsult

                Where do you see that in the documentation? I don't even see + in the documentation. And what idiot thought that was a good idea? :wtf: Time to find a new language; this one's becoming VB. X| Edit: I finally found it; it's not documented with String; what a POS. :thumbsdown: I'm fairly sure that no self-respecting C# professional uses it that way.

                S Offline
                S Offline
                SortaCore
                wrote on last edited by
                #15

                PIEBALDconsult wrote:

                I'm fairly sure that no self-respecting C# professional uses it that way.

                Heh, I go for the shorter version. If it doesn't make sense with a mishmash of ints/strings I use brackets or ToString() to clarify.

                int i = 124, j = 253;
                string s = "JD" + i + j; // Could be two things and no one wants to look up operator precedence, so instead...
                string t = "JD" + (i + j);

                But yeah, usually I don't bother. Although, theoretically, I could now do

                string s = 0; // won't initialise
                string t = "" + 0; // will work fine O.o

                So, let's get back to self-respecting... :rolleyes:

                P 1 Reply Last reply
                0
                • S SortaCore

                  PIEBALDconsult wrote:

                  I'm fairly sure that no self-respecting C# professional uses it that way.

                  Heh, I go for the shorter version. If it doesn't make sense with a mishmash of ints/strings I use brackets or ToString() to clarify.

                  int i = 124, j = 253;
                  string s = "JD" + i + j; // Could be two things and no one wants to look up operator precedence, so instead...
                  string t = "JD" + (i + j);

                  But yeah, usually I don't bother. Although, theoretically, I could now do

                  string s = 0; // won't initialise
                  string t = "" + 0; // will work fine O.o

                  So, let's get back to self-respecting... :rolleyes:

                  P Offline
                  P Offline
                  PIEBALDconsult
                  wrote on last edited by
                  #16

                  string t = System.String.Format ( "JD{0}" , i + j ) ;

                  Richard DeemingR 1 Reply Last reply
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                  • P PIEBALDconsult

                    string t = System.String.Format ( "JD{0}" , i + j ) ;

                    Richard DeemingR Offline
                    Richard DeemingR Offline
                    Richard Deeming
                    wrote on last edited by
                    #17

                    Make that:

                    string t = string.Format(CultureInfo.InvariantCulture, "JD{0:D}", i + j);

                    You typically don't want culture-specific formatting or group separators in the result.


                    "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

                    "These people looked deep within my soul and assigned me a number based on the order in which I joined" - Homer

                    P S 2 Replies Last reply
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                    • Richard DeemingR Richard Deeming

                      Make that:

                      string t = string.Format(CultureInfo.InvariantCulture, "JD{0:D}", i + j);

                      You typically don't want culture-specific formatting or group separators in the result.


                      "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

                      P Offline
                      P Offline
                      PIEBALDconsult
                      wrote on last edited by
                      #18

                      I've never had that problem.

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                      • Richard DeemingR Richard Deeming

                        Make that:

                        string t = string.Format(CultureInfo.InvariantCulture, "JD{0:D}", i + j);

                        You typically don't want culture-specific formatting or group separators in the result.


                        "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

                        S Offline
                        S Offline
                        SortaCore
                        wrote on last edited by
                        #19

                        And of course don't forget to set the string to "" at the end, else if the garbage collector is a little slow you might run out of memory! Better yet, just keep re-using global strings.

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                        • S SortaCore

                          A padded number in a file name!

                          // Set to padded number
                          int fileCount = Directory.GetFiles("[censored]", "*.csv", SearchOption.AllDirectories).Length + 1;
                          string fileCountStr = (fileCount <= 999 ? fileCount <= 99 ? fileCount <= 9 ? "000" : "00" : "0" : "") + fileCount;

                          I think this should win an award for readability in a triply-nested ternary condition :rolleyes:.

                          D Offline
                          D Offline
                          Dennis_E
                          wrote on last edited by
                          #20

                          Wonderful code! When I was new to programming I used to do something like this too. Then I figured out a trick: just add 1.000.000.000 to the number and take the last 4 characters. Now I just use PadLeft, PadRight or Format

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