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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

    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
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      • 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
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                  • 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
                      0
                      • 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
                          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

                            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
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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

                              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
                                    0
                                    • 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
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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.

                                        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.

                                        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

                                          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();

                                          1 Reply Last reply
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