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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

    OriginalGriffO Offline
    OriginalGriffO Offline
    OriginalGriff
    wrote on last edited by
    #8

    I assume you meant it to do this:

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

    :laugh: Would do the same in C and C++ as well.

    Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

    "I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
    "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt

    M 1 Reply Last reply
    0
    • 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

      Kornfeld Eliyahu PeterK Offline
      Kornfeld Eliyahu PeterK Offline
      Kornfeld Eliyahu Peter
      wrote on last edited by
      #9

      I assume that you want to run the second method if first returns true, if that the case you have to switch the order

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

      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

      M 1 Reply Last reply
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      • N Nish Nishant

        |

        Regards, Nish


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

        M Offline
        M Offline
        Marc Clifton
        wrote on last edited by
        #10

        Exactly. :)

        1 Reply Last reply
        0
        • D Deflinek

          I'm not quite sure what was unexpected here. If you mean the ProcessCarrierAnimations() never gets called if (more == true) then it really was expected :) However changing || to | will make it called regardless of more's value.

          -- "My software never has bugs. It just develops random features."

          M Offline
          M Offline
          Marc Clifton
          wrote on last edited by
          #11

          deflinek wrote:

          However changing || to | will make it called regardless of more's value.

          Yup! Marc

          1 Reply Last reply
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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 |.

            M Offline
            M Offline
            Marc Clifton
            wrote on last edited by
            #12

            Yup. | Marc

            1 Reply Last reply
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            • OriginalGriffO OriginalGriff

              I assume you meant it to do this:

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

              :laugh: Would do the same in C and C++ as well.

              Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

              M Offline
              M Offline
              Marc Clifton
              wrote on last edited by
              #13

              OriginalGriff wrote:

              more = ProcessCarrierAnimations() || more;

              Quite so. The bitwise | operator solves the problem too. Marc

              OriginalGriffO 1 Reply Last reply
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              • Kornfeld Eliyahu PeterK Kornfeld Eliyahu Peter

                I assume that you want to run the second method if first returns true, if that the case you have to switch the order

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

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

                M Offline
                M Offline
                Marc Clifton
                wrote on last edited by
                #14

                Kornfeld Eliyahu Peter wrote:

                you have to switch the order

                Yes indeed. Or use the bitwise operator. Marc

                Kornfeld Eliyahu PeterK D 2 Replies Last reply
                0
                • 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
                  Rage
                  wrote on last edited by
                  #15

                  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.

                  B P 2 Replies Last reply
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                  • M Marc Clifton

                    OriginalGriff wrote:

                    more = ProcessCarrierAnimations() || more;

                    Quite so. The bitwise | operator solves the problem too. Marc

                    OriginalGriffO Offline
                    OriginalGriffO Offline
                    OriginalGriff
                    wrote on last edited by
                    #16

                    Yes - but I don't like bitwise operators with bools...

                    Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

                    "I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
                    "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt

                    1 Reply Last reply
                    0
                    • N Nish Nishant

                      |

                      Regards, Nish


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

                      R Offline
                      R Offline
                      Rage
                      wrote on last edited by
                      #17

                      Yep, but this is a workaround, not a best practice though.

                      ~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.

                      1 Reply Last reply
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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

                        Kornfeld Eliyahu PeterK Offline
                        Kornfeld Eliyahu PeterK Offline
                        Kornfeld Eliyahu Peter
                        wrote on last edited by
                        #18

                        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)

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

                        F J 2 Replies Last reply
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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.

                          B Offline
                          B Offline
                          BobJanova
                          wrote on last edited by
                          #19

                          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 F 2 Replies 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

                            K Offline
                            K Offline
                            Keith Barrow
                            wrote on last edited by
                            #20

                            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 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

                              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.

                              1 Reply Last reply
                              0
                              • 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

                                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.

                                  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.

                                  1 Reply Last reply
                                  0
                                  • 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

                                    1 Reply Last reply
                                    0
                                    • 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

                                      1 Reply Last reply
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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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