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PQOTD

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  • M Marc Clifton

    Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

    		bool more = ProcessFlyouts();
    		more = more || ProcessCarrierAnimations();
    

    How would you change it to "do the right thing?" Marc

    C Offline
    C Offline
    Chris Quinn
    wrote on last edited by
    #43

    It compiled?

    ========================================================= I'm an optoholic - my glass is always half full of vodka. =========================================================

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    • P PIEBALDconsult

      I never follow other peoples' rules. :cool:

      You'll never get very far if all you do is follow instructions.

      S Offline
      S Offline
      SortaCore
      wrote on last edited by
      #44

      It's my rule that people have to breathe (or die trying).

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      • M Marc Clifton

        Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

        		bool more = ProcessFlyouts();
        		more = more || ProcessCarrierAnimations();
        

        How would you change it to "do the right thing?" Marc

        A Offline
        A Offline
        Adam Tibi
        wrote on last edited by
        #45

        This is JavaScript style, the developer meant, if "more" is "undefined" then try the other option ProcessCarrierAnimations(). But obviously, this doesn't work in C#.

        Make it simple, as simple as possible, but not simpler.

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        • M Marc Clifton

          Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

          		bool more = ProcessFlyouts();
          		more = more || ProcessCarrierAnimations();
          

          How would you change it to "do the right thing?" Marc

          G Offline
          G Offline
          Gary Wheeler
          wrote on last edited by
          #46

          Just to be contrary:

          bool more = false;
          if (ProcessFlyouts()) more = true;
          if (ProcessCarrierAnimations()) more = true;

          Software Zen: delete this;

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          • N Nish Nishant

            |

            Regards, Nish


            Blog: voidnish.wordpress.com Latest article: C++ 11 features in Visual C++ 2013 Preview

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            G Offline
            Gary Wheeler
            wrote on last edited by
            #47

            Yuck. One of my least favorite things when reading someone else's C/C++ code is when they mix logical and bit-wise operators in an expression. In this case, using a bit-wise operator on bool values just seems wrong.

            Software Zen: delete this;

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            • G Gary Wheeler

              Yuck. One of my least favorite things when reading someone else's C/C++ code is when they mix logical and bit-wise operators in an expression. In this case, using a bit-wise operator on bool values just seems wrong.

              Software Zen: delete this;

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              Nish Nishant
              wrote on last edited by
              #48

              I agree, it's not something I'd use myself. I was only answering Marc's academic question :-)

              Regards, Nish


              Blog: voidnish.wordpress.com Latest article: C++ 11 features in Visual C++ 2013 Preview

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              • N Nish Nishant

                I agree, it's not something I'd use myself. I was only answering Marc's academic question :-)

                Regards, Nish


                Blog: voidnish.wordpress.com Latest article: C++ 11 features in Visual C++ 2013 Preview

                G Offline
                G Offline
                Gary Wheeler
                wrote on last edited by
                #49

                I thought that was the case - your response just seemed rather unNish-like :laugh:.

                Software Zen: delete this;

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                • G Gary Wheeler

                  I thought that was the case - your response just seemed rather unNish-like :laugh:.

                  Software Zen: delete this;

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                  N Offline
                  Nish Nishant
                  wrote on last edited by
                  #50

                  Heh :-)

                  Regards, Nish


                  Blog: voidnish.wordpress.com Latest article: C++ 11 features in Visual C++ 2013 Preview

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                  • B BobJanova

                    It will run either ProcessFlyouts, or ProcessCarrierAnimations, or neither, and the variable will tell you if it successfully ran either. I would imagine you either want && or |.

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                    J Offline
                    James Curran
                    wrote on last edited by
                    #51

                    >> It will run either ProcessFlyouts, or ProcessCarrierAnimations, or neither, Um... Not even close. It will, unquestionably, run ProcessFlyouts. It may also run ProcessCarrierAnimations.

                    Truth, James

                    B 1 Reply Last reply
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                    • M Marc Clifton

                      Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

                      		bool more = ProcessFlyouts();
                      		more = more || ProcessCarrierAnimations();
                      

                      How would you change it to "do the right thing?" Marc

                      J Offline
                      J Offline
                      James Curran
                      wrote on last edited by
                      #52

                      The "early out" semantics of the logical operators (|| and &&) are the same for C#, C++, Java, and C, and have been well-specified since the First Edition of K&R C. How could the result possibly be unexpected?

                      Truth, James

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                      • J James Curran

                        >> It will run either ProcessFlyouts, or ProcessCarrierAnimations, or neither, Um... Not even close. It will, unquestionably, run ProcessFlyouts. It may also run ProcessCarrierAnimations.

                        Truth, James

                        B Offline
                        B Offline
                        BobJanova
                        wrote on last edited by
                        #53

                        That is pretty close to what I said, although that was admittedly technically wrong. (I understand how || works but apparently failed in the challenge of writing English!) "Not even close" would be "it returns banana or grapefruit depending on the wolf".

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                        • Kornfeld Eliyahu PeterK Kornfeld Eliyahu Peter

                          I do not like that change from C/C++...I mean the | and || changes... X|

                          I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)

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                          J Offline
                          James Curran
                          wrote on last edited by
                          #54

                          >> I do not like that change from C/C++...I mean the | and || changes... Exactly, what changes are those? I've used C# for 10 ten years, and C/C++ for the ten years before that, and have noticed no differences in the handling of logical operators.

                          Truth, James

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                          • M Marc Clifton

                            Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

                            		bool more = ProcessFlyouts();
                            		more = more || ProcessCarrierAnimations();
                            

                            How would you change it to "do the right thing?" Marc

                            R Offline
                            R Offline
                            RichardInToronto
                            wrote on last edited by
                            #55

                            My bet is that ProcessCarrierAnimations isn't executed if ProcessFlyouts returns true. If ProcessCarrierAnimations should still be called, you could remove one of the "vertical bars", changing the "short-circuit" OR into a regular logical-OR. Richard

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                            • M Marc Clifton

                              You should be able to glean what the programmer intends to happen from the code. :) Marc

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                              patbob
                              wrote on last edited by
                              #56

                              Without further information, it is obvious that the programmer intended ProcessCarrierAnimations() to only be called if ProcessFlyouts() returns false. I'm with OriginalGriff on this..

                              ProcessCarrierAnimations() || more;

                              This is clearly the better way to express intent that using a bitwise OR. Unless there are tests like this all over the code done with bitwise ORs, using one here requires the next programmer to notice you did something atypical here in a fairly subtle way, which means its a maintenance hazard, which in my book is part of the definition of poor coding.

                              We can program with only 1's, but if all you've got are zeros, you've got nothing.

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                              • R RichardInToronto

                                My bet is that ProcessCarrierAnimations isn't executed if ProcessFlyouts returns true. If ProcessCarrierAnimations should still be called, you could remove one of the "vertical bars", changing the "short-circuit" OR into a regular logical-OR. Richard

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                                Fernando Takeshi Sato
                                wrote on last edited by
                                #57

                                hhhmmm...I never thought of bitwise operators as being the 'regular' ones; quite the contrary, actually.

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                                • M Marc Clifton

                                  Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

                                  		bool more = ProcessFlyouts();
                                  		more = more || ProcessCarrierAnimations();
                                  

                                  How would you change it to "do the right thing?" Marc

                                  M Offline
                                  M Offline
                                  Member_5893260
                                  wrote on last edited by
                                  #58

                                  It failed to run ProcessCarrierAnimations because more was already true, and thus the evaluator short-circuited. You want something like this:

                                  bool more=ProcessFlyouts();
                                  bool more2=ProcessCarrierAnimations();
                                  more = more || more2;

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                                  • M Marc Clifton

                                    Programming Quiz of the day. I just wrote this code (C#), which did something very unexpected. What was it that it unexpectedly did?

                                    		bool more = ProcessFlyouts();
                                    		more = more || ProcessCarrierAnimations();
                                    

                                    How would you change it to "do the right thing?" Marc

                                    U Offline
                                    U Offline
                                    User 10244914
                                    wrote on last edited by
                                    #59

                                    if(!ProcessFlyouts()) { ProcessCarrierAnimations() }

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