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  3. goto... Who uses it?

goto... Who uses it?

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  • D DanielSheets

    For what part? Why would I need to use exception handling when thats exactly what TryParse is used for (assuming thats what you're talking about)?

    L Offline
    L Offline
    Lost User
    wrote on last edited by
    #25

    ..on how to throw an exception. I wouldn't even expect the "if's", but rather a loop; and have each condition in a separate class.

            using (StreamWriter sw = new StreamWriter(tmpFilePath))
            {
                foreach (DataGridClass dgc in dataList)
                {
                    foreach (var thingToTest in ParsesClasses)
                    {
                         Results.Add( thingToTest (dgc) );
                    }
    

    Wrap it in a try-catch, and done.

    Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

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    • L Lost User

      ..on how to throw an exception. I wouldn't even expect the "if's", but rather a loop; and have each condition in a separate class.

              using (StreamWriter sw = new StreamWriter(tmpFilePath))
              {
                  foreach (DataGridClass dgc in dataList)
                  {
                      foreach (var thingToTest in ParsesClasses)
                      {
                           Results.Add( thingToTest (dgc) );
                      }
      

      Wrap it in a try-catch, and done.

      Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

      D Offline
      D Offline
      DanielSheets
      wrote on last edited by
      #26

      Thats swift. I'll be the first to admit that I dont have the experience or knowledge of 90% of the people here. Interesting.

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      • D DanielSheets

        This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

        D Offline
        D Offline
        Dave Kreskowiak
        wrote on last edited by
        #27

        I haven't used a "goto" since.....let's see now.....1995, in some assembly language I was writing for a graphics library. This s, if you call any flavor of JMP a "goto". Come to think of it, that's probably around the last time I've ever used the keyword "goto" in any higher languages.

        A guide to posting questions on CodeProject[^]
        Dave Kreskowiak

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        • C Chris Maunder

          In SQL - fairly often to jump to the error handler at the end of our sprocs. I'll admit there's no good reason we do this, since it's easy enough for us to avoid this with if statements, but it's a pattern used in our original code and so for consistency we stuck with it:

          Create Procedure MyProc as

          Begin Tran
          
          -- Do stuff...
          
          if @@error <> 0 goto errorHandler
          
          Commit Tran
          Return 0
          

          errorHandler:
          Rollback Tran
          Return 1

          cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP

          D Offline
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          Dexterus
          wrote on last edited by
          #28

          For this same reason it was used in our C code (kernel, various drivers). Not had to use it yet but I can see some uses if you want the CPU/compiler to execute/optimize properly.

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          • D DanielSheets

            Thats swift. I'll be the first to admit that I dont have the experience or knowledge of 90% of the people here. Interesting.

            D Offline
            D Offline
            dusty_dex
            wrote on last edited by
            #29

            That looks bad to me. Aren't you supposed to use

            break ;

            to jump out of loops? Exception handling will usually bog down the handled block of code.

            Q. Hey man! have you sorted out the finite soup machine? A. Why yes, it's celery or tomato.

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            • D DanielSheets

              This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

              C Offline
              C Offline
              Chris Losinger
              wrote on last edited by
              #30

              depends on the language. sometimes, there is no way to avoid it.

              image processing toolkits | batch image processing

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              • D DanielSheets

                This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                G Offline
                G Offline
                glennPattonWork3
                wrote on last edited by
                #31

                I have always thought goto was the equlivant of the assembly language jmp (blocking?), if it is I used one this morning. Goto is also acceptable in RTOS situations (which Windows isn't) if you want the valve to close now and not later. Glenn

                1 Reply Last reply
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                • B BobJanova

                  Isyourspacebarfaulty? 'Go to' is two words.

                  S Offline
                  S Offline
                  S Douglas
                  wrote on last edited by
                  #32

                  His second stop was the bar, then other places and to write this post. I am assuming he is still enjoying the effects of the local bar. :)


                  Common sense is admitting there is cause and effect and that you can exert some control over what you understand.

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                  • W wizardzz

                    Use it in .bat files all the time.

                    S Offline
                    S Offline
                    S Douglas
                    wrote on last edited by
                    #33

                    wizardzz wrote:

                    in .bat files all the time.

                    I second that.


                    Common sense is admitting there is cause and effect and that you can exert some control over what you understand.

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                    0
                    • C Chris Maunder

                      In SQL - fairly often to jump to the error handler at the end of our sprocs. I'll admit there's no good reason we do this, since it's easy enough for us to avoid this with if statements, but it's a pattern used in our original code and so for consistency we stuck with it:

                      Create Procedure MyProc as

                      Begin Tran
                      
                      -- Do stuff...
                      
                      if @@error <> 0 goto errorHandler
                      
                      Commit Tran
                      Return 0
                      

                      errorHandler:
                      Rollback Tran
                      Return 1

                      cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP

                      J Offline
                      J Offline
                      J4amieC
                      wrote on last edited by
                      #34

                      If that's T-SQL in anything resembling modern SQL Server, there are much, much better constructs for error handling now.

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                      • D DanielSheets

                        This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                        N Offline
                        N Offline
                        Nemanja Trifunovic
                        wrote on last edited by
                        #35

                        Real programmers (ones who code in languages like assembly, C and FORTRAN) use it all the time. Rest of us - rarely if ever.

                        utf8-cpp

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                        • D DanielSheets

                          This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                          L Offline
                          L Offline
                          Lost User
                          wrote on last edited by
                          #36

                          Well as an assembly programmer I really don't have much choice. And as for higher level languages, sure, though rarely. There are people who religiously avoid it, but that's just silly. We must remember the reason it is seen as bad, and not open a witchhunt. Introducing a boolean variable just to quit out of a non-enclosing loop makes readability/understandability worse, not better, and refactoring an inner loop into its own function just so you can return out of it creates a bunch of tightly-coupled functions that do nothing useful on their own. Besides, that return would essentially be a goto.

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                          • D dusty_dex

                            That looks bad to me. Aren't you supposed to use

                            break ;

                            to jump out of loops? Exception handling will usually bog down the handled block of code.

                            Q. Hey man! have you sorted out the finite soup machine? A. Why yes, it's celery or tomato.

                            L Offline
                            L Offline
                            Lost User
                            wrote on last edited by
                            #37

                            Unfortunately that Java feature is not in C#.

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                            • M Maximilien

                              I've not used it in a long time. There are a few of them in our legacy code, but no new code have them; they are mostly used for quick exit of a function to do cleanup.

                              Nihil obstat

                              J Offline
                              J Offline
                              John M Drescher
                              wrote on last edited by
                              #38

                              Honestly, I have written at least 1 million lines of code since I have used a goto. Although I do remember using a few gotos in the 1990s. Also long gone from my coding is writing x86 assembly code.

                              John

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                              • D DanielSheets

                                This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

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                                R Offline
                                Ron Anders
                                wrote on last edited by
                                #39

                                Me: goto Me;

                                1 Reply Last reply
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                                • D DanielSheets

                                  This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                                  K Offline
                                  K Offline
                                  kmoorevs
                                  wrote on last edited by
                                  #40

                                  In one of our legacy apps (VB) the goto is used to apply database updates based on the exe version. ErrorHandlers: seperate the update logic for each version and are arranged from top to bottom so that code execution always 'fall through' to the bottom. It may me wrong but it works!

                                  "Go forth into the source" - Neal Morse

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                                  • D DanielSheets

                                    This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                                    R Offline
                                    R Offline
                                    RugbyLeague
                                    wrote on last edited by
                                    #41

                                    I put it into my own language just because I wanted to see if I could write a program all in one function which started at the bottom and worked its way to the top. I am not sure why, one of those days. I then immediately removed it from the language spec although the code for it is still in the compiler source - just commented out.

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                                    • D DanielSheets

                                      This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                                      H Offline
                                      H Offline
                                      H Brydon
                                      wrote on last edited by
                                      #42

                                      I only use it nowadays in assembly (no choice) and scripting languages that don't have good structured programming constructs (ie. if/then/else etc.). I learned programming in the days of early Fortran IV (and actually regressed a little on an older machine with Fortran IID) that only had arithmetic if[^] and computed goto[^] for conditional logic flow. I really came to appreciate the evils of the 'goto' statement and never use them unless there is no other choice. If I use a goto, it will always transfer control downwards, never up. And yes, I use break and continue, and multiple returns in methods.

                                      -- Harvey

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                                      • L Lost User

                                        Unfortunately that Java feature is not in C#.

                                        D Offline
                                        D Offline
                                        dusty_dex
                                        wrote on last edited by
                                        #43

                                        Wow! what an oversight. It sure makes life easier.

                                        Q. Hey man! have you sorted out the finite soup machine? A. Why yes, it's celery or tomato.

                                        1 Reply Last reply
                                        0
                                        • D DanielSheets

                                          This isn't a programming question. Anyway... I find it useful in very few situations. It can make for cleaner code if used correctly. Of course, it can also be over used.

                                          D Offline
                                          D Offline
                                          dan sh
                                          wrote on last edited by
                                          #44

                                          .Net framework uses that. They just built some fancy keywords that do the same thing but have a different name. For instance, continue.

                                          "Bastards encourage idiots to use Oracle Forms, Web Forms, Access and a number of other dinky web publishing tolls.", Mycroft Holmes[^]

                                          K 1 Reply Last reply
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