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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

    P Offline
    P Offline
    PIEBALDconsult
    wrote on last edited by
    #21

    more |= ProcessCarrierAnimations(); ?

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

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    • M Marc Clifton

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

      B Offline
      B Offline
      Bassam Abdul Baki
      wrote on last edited by
      #22

      Marc Clifton wrote:

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

      Riiiiiiiiiiight!!! :)

      Web - BM - RSS - Math - LinkedIn

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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.

        R Offline
        R Offline
        Rage
        wrote on last edited by
        #23

        Let's say I have never seen these two lines of code, OK ?

        ~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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        • M Marc Clifton

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

          S Offline
          S Offline
          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

            A Offline
            A Offline
            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)

              F Offline
              F Offline
              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
              0
              • 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.

                F Offline
                F Offline
                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

                  P Offline
                  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

                    F 1 Reply Last reply
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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.[^]

                      P Offline
                      P Offline
                      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.

                        P Offline
                        P Offline
                        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.

                        S 1 Reply Last reply
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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)

                          F Offline
                          F Offline
                          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
                          0
                          • 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

                            J 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

                              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.

                              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
                                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[^]

                                P 1 Reply Last reply
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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[^]

                                  P Offline
                                  P Offline
                                  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.

                                  J 1 Reply Last reply
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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.

                                    J Offline
                                    J Offline
                                    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[^]

                                    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

                                      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

                                      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

                                        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

                                          D Offline
                                          D Offline
                                          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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