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PQOTD

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  • M Marc Clifton

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

    S Offline
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    Simon_Whale
    wrote on last edited by
    #24

    Have you been to QA lately? :laugh:

    Every day, thousands of innocent plants are killed by vegetarians. Help end the violence EAT BACON

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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

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      Andy Brummer
      wrote on last edited by
      #25

      var more = more || initalizeMore(); is a common practice in javascript.

      Curvature of the Mind now with 3D

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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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        Forogar
        wrote on last edited by
        #26

        This isn't a change from C++. It works the same way for both operators. Doesn't it? Now I'm going to have to read up on it, dammit!

        - I would love to change the world, but they won’t give me the source code.

        Kornfeld Eliyahu PeterK 1 Reply Last reply
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        • B BobJanova

          There's actually some nice concise uses of

          var result = DoSomething() && DoSomethingThatDependsOnIt();
          var result = DoSomething() || HandleFailureCase();

          It's even better in languages where you can use non-boolean types with the boolean operators.

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          Forogar
          wrote on last edited by
          #27

          Ouch! && Ouch! || Ouch!

          - I would love to change the world, but they won’t give me the source code.

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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

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            P Offline
            Pete OHanlon
            wrote on last edited by
            #28

            Now, I'm not going to look at the other answers before I post so I don't know if others have got it right, or if there are additional nuggets of information. If ProcessFlyouts returns true then the second test isn't carried out - it's a conditional OR statement. So, if you want ProcessCarrierAnimations to be evaluated, convert it to

            more = more | ProcessCarrierAnimations();

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            • F Forogar

              This isn't a change from C++. It works the same way for both operators. Doesn't it? Now I'm going to have to read up on it, dammit!

              - I would love to change the world, but they won’t give me the source code.

              Kornfeld Eliyahu PeterK Offline
              Kornfeld Eliyahu PeterK Offline
              Kornfeld Eliyahu Peter
              wrote on last edited by
              #29

              You have to! Otherwise you may end up with some mess if updating C/C++ to C# (what I'm doing just now)...

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

              "It never ceases to amaze me that a spacecraft launched in 1977 can be fixed remotely from Earth." ― Brian Cox

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              • K Keith Barrow

                Though Nish's and OG's examples will work, I think it is symantically better to do this:

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

                Less terse code (normally bad) - but explicit in calling ProcessCarrierAnimations.

                PB 369,783 wrote:

                I just find him very unlikeable, and I think the way he looks like a prettier version of his Mum is very disturbing.[^]

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                PIEBALDconsult
                wrote on last edited by
                #30

                "Eliminate needless local variables." :-D

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

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                • R Rage

                  MISRA[^] Rule 33 & 34:

                  The right hand operand of a || shall not contain side effects
                  The operands of a logical || shall be primary expressions

                  The example you gave is the very reason for the above two rules.

                  ~RaGE();

                  I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus Entropy isn't what it used to.

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                  PIEBALDconsult
                  wrote on last edited by
                  #31

                  I never follow other peoples' rules. :cool:

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

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                  • Kornfeld Eliyahu PeterK Kornfeld Eliyahu Peter

                    You have to! Otherwise you may end up with some mess if updating C/C++ to C# (what I'm doing just now)...

                    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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                    Forogar
                    wrote on last edited by
                    #32

                    Nah! As long as it compiles...

                    - I would love to change the world, but they won’t give me the source code.

                    Kornfeld Eliyahu PeterK 1 Reply Last reply
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                    • F Forogar

                      Nah! As long as it compiles...

                      - I would love to change the world, but they won’t give me the source code.

                      Kornfeld Eliyahu PeterK Offline
                      Kornfeld Eliyahu PeterK Offline
                      Kornfeld Eliyahu Peter
                      wrote on last edited by
                      #33

                      Yeah! It compiles. After then you can rub your head to find where the bug is!

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

                      "It never ceases to amaze me that a spacecraft launched in 1977 can be fixed remotely from Earth." ― Brian Cox

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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

                        Richard Andrew x64R Offline
                        Richard Andrew x64R Offline
                        Richard Andrew x64
                        wrote on last edited by
                        #34

                        How about:

                        more &= ProcessCarrierAnimations();

                        The difficult we do right away... ...the impossible takes slightly longer.

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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
                          Jorgen Andersson
                          wrote on last edited by
                          #35

                          Is it just me that would have done it as a oneliner?

                          Wrong is evil and must be defeated. - Jeff Ello[^]

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                          • J Jorgen Andersson

                            Is it just me that would have done it as a oneliner?

                            Wrong is evil and must be defeated. - Jeff Ello[^]

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                            PIEBALDconsult
                            wrote on last edited by
                            #36

                            That could make setting a breakpoint on the second call difficult. :shrug:

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

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                            • P PIEBALDconsult

                              That could make setting a breakpoint on the second call difficult. :shrug:

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

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                              Jorgen Andersson
                              wrote on last edited by
                              #37

                              No big deal to change if necessary. :shrug: But I actually find it easier to read on one line.

                              Wrong is evil and must be defeated. - Jeff Ello[^]

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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

                                E Offline
                                E Offline
                                Ennis Ray Lynch Jr
                                wrote on last edited by
                                #38

                                -|

                                Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. "And they, since they Were not the one dead, turned to their affairs" -- Robert Frost "All users always want Excel" --Ennis Lynch

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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
                                  Ravi Bhavnani
                                  wrote on last edited by
                                  #39

                                  There's a risk that ProcessCarrierAnimations() may never be invoked, so the right thing (IMHO) would be to do something like this:

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

                                  /ravi

                                  My new year resolution: 2048 x 1536 Home | Articles | My .NET bits | Freeware ravib(at)ravib(dot)com

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                                  • M Marc Clifton

                                    Kornfeld Eliyahu Peter wrote:

                                    you have to switch the order

                                    Yes indeed. Or use the bitwise operator. Marc

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                                    dan sh
                                    wrote on last edited by
                                    #40

                                    Marc Clifton wrote:

                                    bitwise operator

                                    So boolean is foolish?

                                    My CP workspace: Incredibly trivial and probably useless code samples[^]

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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

                                      D Offline
                                      D Offline
                                      dan sh
                                      wrote on last edited by
                                      #41

                                      No it did not do anything unexpected. || operator uses short-circuit evaluation. I would assume the intent was to call ProcessCarrierAnimations only if more was false.

                                      My CP workspace: Incredibly trivial and probably useless code samples[^]

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                                      • Kornfeld Eliyahu PeterK Kornfeld Eliyahu Peter

                                        Yeah! It compiles. After then you can rub your head to find where the bug is!

                                        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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                                        JimmyRopes
                                        wrote on last edited by
                                        #42

                                        Kornfeld Eliyahu Peter wrote:

                                        It compiles. After then you someone else will can rub your their head to find where the bug is!

                                        FTFY :-D

                                        The report of my death was an exaggeration - Mark Twain
                                        Simply Elegant Designs JimmyRopes Designs
                                        I'm on-line therefore I am. JimmyRopes

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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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