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  4. can anybody tell me how this code works

can anybody tell me how this code works

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  • P philiptabraham

    int compute(int n) { if(n>0) { n=compute(n-3)+compute(n-1) return n; } return 1; } void main() { x=compute(5); cout<<x; } o/p:9 can anybody explain in detail the flow

    I Offline
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    Iain Clarke Warrior Programmer
    wrote on last edited by
    #5

    philiptabraham wrote:

    o/p:9 can anybody explain in detail the flow

    1/ Fire up visual studio. 2/ Compile your program. 3/ set a breakpoint in main. 4/ Assuming VS6, press f11 to step into compute. put n in your watch window. 5/ press f11 a lot, until the program is finished. 6/ Enjoy your new shiny enlightenment. Fight evil monks on bleak mountains. Iain.

    Plz sir... CPallini CPallini abuz drugz, plz plz help urgent.

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    • I Iain Clarke Warrior Programmer

      philiptabraham wrote:

      o/p:9 can anybody explain in detail the flow

      1/ Fire up visual studio. 2/ Compile your program. 3/ set a breakpoint in main. 4/ Assuming VS6, press f11 to step into compute. put n in your watch window. 5/ press f11 a lot, until the program is finished. 6/ Enjoy your new shiny enlightenment. Fight evil monks on bleak mountains. Iain.

      Plz sir... CPallini CPallini abuz drugz, plz plz help urgent.

      C Offline
      C Offline
      CPallini
      wrote on last edited by
      #6

      Iain Clarke wrote:

      5/ press f11 a lot, until the program is finished.

      press f11 a lot and a lot and a lot... Since the program experiences infinite recursion. :-D I was wrong. :-O

      If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
      This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

      modified on Friday, April 18, 2008 10:21 AM

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      • C CPallini

        Iain Clarke wrote:

        5/ press f11 a lot, until the program is finished.

        press f11 a lot and a lot and a lot... Since the program experiences infinite recursion. :-D I was wrong. :-O

        If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
        This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

        modified on Friday, April 18, 2008 10:21 AM

        I Offline
        I Offline
        Iain Clarke Warrior Programmer
        wrote on last edited by
        #7

        Well, no one said the road to enlightenment would be easy! Maybe step 4.5 should have been "make yourself comfortable, with a barrel of castlemaine 6X." Iain.

        Plz sir... CPallini CPallini abuz drugz, plz plz help urgent.

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        • I Iain Clarke Warrior Programmer

          Well, no one said the road to enlightenment would be easy! Maybe step 4.5 should have been "make yourself comfortable, with a barrel of castlemaine 6X." Iain.

          Plz sir... CPallini CPallini abuz drugz, plz plz help urgent.

          C Offline
          C Offline
          CPallini
          wrote on last edited by
          #8

          Alcoholic! :-D

          If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
          This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

          1 Reply Last reply
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          • C CPallini

            Rajesh R Subramanian wrote:

            If it works

            Good point, indeed. :-D

            If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
            This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

            R Offline
            R Offline
            Rajesh R Subramanian
            wrote on last edited by
            #9

            Nah! I said that because the OP seems to be *wondering* how it works. That code should work, BTW [insert very much unsure smiley here]. I don't have a compiler here though.

            Nobody can give you wiser advice than yourself. - Cicero .·´¯`·->Rajesh<-·´¯`·. Codeproject.com: Visual C++ MVP

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            • P philiptabraham

              int compute(int n) { if(n>0) { n=compute(n-3)+compute(n-1) return n; } return 1; } void main() { x=compute(5); cout<<x; } o/p:9 can anybody explain in detail the flow

              D Offline
              D Offline
              David Crow
              wrote on last edited by
              #10

              It won't until you fix at least two syntax errors. :rolleyes:

              "Love people and use things, not love things and use people." - Unknown

              "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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              • C CPallini

                I can tell you why it doesn't work: it goes into infinite recursion. I was wrong. :)

                If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

                modified on Friday, April 18, 2008 10:19 AM

                D Offline
                D Offline
                David Crow
                wrote on last edited by
                #11

                CPallini wrote:

                it goes into infinite recursion.

                While I don't know exactly what it computes, it does indeed terminate.

                "Love people and use things, not love things and use people." - Unknown

                "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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                • I Iain Clarke Warrior Programmer

                  philiptabraham wrote:

                  o/p:9 can anybody explain in detail the flow

                  1/ Fire up visual studio. 2/ Compile your program. 3/ set a breakpoint in main. 4/ Assuming VS6, press f11 to step into compute. put n in your watch window. 5/ press f11 a lot, until the program is finished. 6/ Enjoy your new shiny enlightenment. Fight evil monks on bleak mountains. Iain.

                  Plz sir... CPallini CPallini abuz drugz, plz plz help urgent.

                  T Offline
                  T Offline
                  ThatsAlok
                  wrote on last edited by
                  #12

                  that the right way to debug a program :)

                  "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                  Never mind - my own stupidity is the source of every "problem" - Mixture

                  cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                  1 Reply Last reply
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                  • C CPallini

                    I can tell you why it doesn't work: it goes into infinite recursion. I was wrong. :)

                    If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                    This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

                    modified on Friday, April 18, 2008 10:19 AM

                    T Offline
                    T Offline
                    ThatsAlok
                    wrote on last edited by
                    #13

                    it working fine for me.. it not going in infinite recursion!

                    "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                    Never mind - my own stupidity is the source of every "problem" - Mixture

                    cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                    C 1 Reply Last reply
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                    • D David Crow

                      It won't until you fix at least two syntax errors. :rolleyes:

                      "Love people and use things, not love things and use people." - Unknown

                      "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                      T Offline
                      T Offline
                      ThatsAlok
                      wrote on last edited by
                      #14

                      :-D plus inclusion of header file :)

                      "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                      Never mind - my own stupidity is the source of every "problem" - Mixture

                      cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                      T 1 Reply Last reply
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                      • D David Crow

                        CPallini wrote:

                        it goes into infinite recursion.

                        While I don't know exactly what it computes, it does indeed terminate.

                        "Love people and use things, not love things and use people." - Unknown

                        "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                        C Offline
                        C Offline
                        CPallini
                        wrote on last edited by
                        #15

                        Yes, it is true, I was wrong. :)

                        If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                        This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

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                        • T ThatsAlok

                          it working fine for me.. it not going in infinite recursion!

                          "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                          Never mind - my own stupidity is the source of every "problem" - Mixture

                          cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                          C Offline
                          C Offline
                          CPallini
                          wrote on last edited by
                          #16

                          http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2513484[^] :)

                          If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                          This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

                          1 Reply Last reply
                          0
                          • C CPallini

                            Yes, it is true, I was wrong. :)

                            If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                            This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

                            T Offline
                            T Offline
                            ThatsAlok
                            wrote on last edited by
                            #17

                            sorry i am late :)

                            "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                            Never mind - my own stupidity is the source of every "problem" - Mixture

                            cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                            1 Reply Last reply
                            0
                            • T ThatsAlok

                              :-D plus inclusion of header file :)

                              "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                              Never mind - my own stupidity is the source of every "problem" - Mixture

                              cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You/codeProject$$>

                              T Offline
                              T Offline
                              ThatsAlok
                              wrote on last edited by
                              #18

                              Ok!

                              "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                              Never mind - my own stupidity is the source of every "problem" - Mixture

                              cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You

                              1 Reply Last reply
                              0
                              • R Rajesh R Subramanian

                                Nah! I said that because the OP seems to be *wondering* how it works. That code should work, BTW [insert very much unsure smiley here]. I don't have a compiler here though.

                                Nobody can give you wiser advice than yourself. - Cicero .·´¯`·->Rajesh<-·´¯`·. Codeproject.com: Visual C++ MVP

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                                T Offline
                                ThatsAlok
                                wrote on last edited by
                                #19

                                Rajesh R Subramanian wrote:

                                I don't have a compiler here though.

                                If don't have .. invent one... :-)

                                "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
                                Never mind - my own stupidity is the source of every "problem" - Mixture

                                cheers, Alok Gupta VC Forum Q&A :- I/IV Support CRY- Child Relief and You

                                1 Reply Last reply
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