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For loop horror

Scheduled Pinned Locked Moved The Weird and The Wonderful
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  • L Llasus

    I just spent an hour trying to think why the process didn't work. for(int nindex = MIN_VAL; nindex <= MAX_VAL; nindex++); { //50 lines of code that processes something } Maybe everyone has these kind of moments. :doh:

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    Nemanja Trifunovic
    wrote on last edited by
    #12

    Switch to a language that does not have loops (Haskell, for instance) and you won't have these problems any more :)


    Programming Blog utf8-cpp

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    • C cp9876

      Luc Pattyn wrote:

      The compiler will help you

      Only the more recent ones - VC6 for example promoted the loop index to scope outside the loop.:)


      Peter "Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

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      jhwurmbach
      wrote on last edited by
      #13

      cp9876 wrote:

      VC6 for example promoted the loop index to scope outside the loop.

      That is one of many reasons why VC6 is regarded as extremely braindead... In fact it isn't a C++ compiler. Just a compiler that compiles a language looking a lot like C++...


      Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
      Douglas Adams, "Dirk Gently's Holistic Detective Agency"

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      • L Llasus

        I just spent an hour trying to think why the process didn't work. for(int nindex = MIN_VAL; nindex <= MAX_VAL; nindex++); { //50 lines of code that processes something } Maybe everyone has these kind of moments. :doh:

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        D Offline
        Dewm Solo
        wrote on last edited by
        #14

        Oh my god....and I was looking ....and looking....and looking.... The conditional statement was fine....and I couldn't find it at all....keep looking and reading all the comments here. Couldn't find it. I was about to give up and ask when BLAM!!!!! I saw it...there... That never happened to me. Luckily! I've done similar though and lost a good 3~4 hours of time trying to figure it out. I am actually surprised that this compiles though...and runs. Shouldn't the compiler complain about this?

        Dewm Solo - Managed C++ Developer

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        • L Llasus

          I just spent an hour trying to think why the process didn't work. for(int nindex = MIN_VAL; nindex <= MAX_VAL; nindex++); { //50 lines of code that processes something } Maybe everyone has these kind of moments. :doh:

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          Simon Capewell
          wrote on last edited by
          #15

          Dammit, I had to stick this in the IDE and debug it to work out what the hell was wrong with this. I think I've been doing a little too much ASP maintenance today :sigh:

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          • N Nitron

            if it makes you feel any better, it took me about 5 mins of looking at it over and over again before i noticed what you were talking about :doh:

            ~Nitron.


            ññòòïðïðB A
            start

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            Chris Losinger
            wrote on last edited by
            #16

            same here

            image processing toolkits | batch image processing

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            • C Chris Losinger

              same here

              image processing toolkits | batch image processing

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              emiaj
              wrote on last edited by
              #17

              me too, then i saw it, the bug is on *beeeeeeeeep!* right there :)

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              • E emiaj

                me too, then i saw it, the bug is on *beeeeeeeeep!* right there :)

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                Thea Ganoe
                wrote on last edited by
                #18

                *beeeep* what's wrong...can't say "semicolon" ???

                caridad

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                • D Dewm Solo

                  Oh my god....and I was looking ....and looking....and looking.... The conditional statement was fine....and I couldn't find it at all....keep looking and reading all the comments here. Couldn't find it. I was about to give up and ask when BLAM!!!!! I saw it...there... That never happened to me. Luckily! I've done similar though and lost a good 3~4 hours of time trying to figure it out. I am actually surprised that this compiles though...and runs. Shouldn't the compiler complain about this?

                  Dewm Solo - Managed C++ Developer

                  J Offline
                  J Offline
                  Jimmanuel
                  wrote on last edited by
                  #19

                  Dewm Solo wrote:

                  Shouldn't the compiler complain about this?

                  No, it's perfectly valid to stuff all of the loops processing into the ( ; ; ) of a for statement and create a loop with no explicitly defined code block. This has it's uses, but I always just enjoyed using it to obfuscate my code :)

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                  • N Nitron

                    if it makes you feel any better, it took me about 5 mins of looking at it over and over again before i noticed what you were talking about :doh:

                    ~Nitron.


                    ññòòïðïðB A
                    start

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                    L Offline
                    Llasus
                    wrote on last edited by
                    #20

                    :laugh: nice one! actually it did! :laugh:

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                    • S Stephen Hewitt

                      A classic C/C++ error; you haven't been coding long enough if you haven't run into this one before.

                      Steve

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                      Llasus
                      wrote on last edited by
                      #21

                      I've been coding for about 5 years of my life. Maybe its more of the experience though. Since I haven't really encountered this until last time. :D

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                      • N Nitron

                        if it makes you feel any better, it took me about 5 mins of looking at it over and over again before i noticed what you were talking about :doh:

                        ~Nitron.


                        ññòòïðïðB A
                        start

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                        A Offline
                        Andy Brummer
                        wrote on last edited by
                        #22

                        I didn't get it until Marc's comment about the body only running once.


                        This blanket smells like ham

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                        • D Dewm Solo

                          Oh my god....and I was looking ....and looking....and looking.... The conditional statement was fine....and I couldn't find it at all....keep looking and reading all the comments here. Couldn't find it. I was about to give up and ask when BLAM!!!!! I saw it...there... That never happened to me. Luckily! I've done similar though and lost a good 3~4 hours of time trying to figure it out. I am actually surprised that this compiles though...and runs. Shouldn't the compiler complain about this?

                          Dewm Solo - Managed C++ Developer

                          D Offline
                          D Offline
                          DavidNohejl
                          wrote on last edited by
                          #23

                          Dewm Solo wrote:

                          I am actually surprised that this compiles though...and runs. Shouldn't the compiler complain about this?

                          Yeah. While it should of course compile, I'd want this warning: http://msdn2.microsoft.com/en-us/library/9x19t380(vs.80).aspx[^]


                          [My Blog]
                          "Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn
                          "Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

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                          • N Nitron

                            if it makes you feel any better, it took me about 5 mins of looking at it over and over again before i noticed what you were talking about :doh:

                            ~Nitron.


                            ññòòïðïðB A
                            start

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                            leppie
                            wrote on last edited by
                            #24

                            I had to look for help :)

                            xacc.ide
                            The rule of three: "The first time you notice something that might repeat, don't generalize it. The second time the situation occurs, develop in a similar fashion -- possibly even copy/paste -- but don't generalize yet. On the third time, look to generalize the approach."

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                            • D DavidNohejl

                              Dewm Solo wrote:

                              I am actually surprised that this compiles though...and runs. Shouldn't the compiler complain about this?

                              Yeah. While it should of course compile, I'd want this warning: http://msdn2.microsoft.com/en-us/library/9x19t380(vs.80).aspx[^]


                              [My Blog]
                              "Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn
                              "Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

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                              D Offline
                              Dewm Solo
                              wrote on last edited by
                              #25

                              Indeed! Right on the button.

                              Dewm Solo - Managed C++ Developer

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                              • L Llasus

                                I just spent an hour trying to think why the process didn't work. for(int nindex = MIN_VAL; nindex <= MAX_VAL; nindex++); { //50 lines of code that processes something } Maybe everyone has these kind of moments. :doh:

                                S Offline
                                S Offline
                                snorkie
                                wrote on last edited by
                                #26

                                I was starting to get mad at this code, thinking it is one of those "inside" jokes where everybody laughs until you start laughing, then they laugh harder cause there is no joke. Nobody said what the problem was. Then after reading all the comments, I went back and reviewed it again. I found the issue! Funny how it never shows up till the end. Hogan

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                                • S snorkie

                                  I was starting to get mad at this code, thinking it is one of those "inside" jokes where everybody laughs until you start laughing, then they laugh harder cause there is no joke. Nobody said what the problem was. Then after reading all the comments, I went back and reviewed it again. I found the issue! Funny how it never shows up till the end. Hogan

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                                  Llasus
                                  wrote on last edited by
                                  #27

                                  yes, just like the code when you encounter it. wasn't funny until you end up looking at it for 30 or so minutes and seeing that the semicolon was the problem. :D

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                                  • L Llasus

                                    I just spent an hour trying to think why the process didn't work. for(int nindex = MIN_VAL; nindex <= MAX_VAL; nindex++); { //50 lines of code that processes something } Maybe everyone has these kind of moments. :doh:

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                                    C Offline
                                    CPallini
                                    wrote on last edited by
                                    #28

                                    When happened to me, I thought for a (long) while about a compiler bug, before finding the ****** semicolon. :)

                                    If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

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                                    • C CPallini

                                      When happened to me, I thought for a (long) while about a compiler bug, before finding the ****** semicolon. :)

                                      If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

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                                      L Offline
                                      Lars Wadefalk
                                      wrote on last edited by
                                      #29

                                      took me about five seconds to see the error. maybe I've stumbled into most shit already.

                                      Larswad

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