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Logic problem

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  • C Chris Maunder

    You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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    Michael A Barnhart
    wrote on last edited by
    #6

    Well getting to 10 minutes is easier. OK :-O

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    • C Chris Maunder

      You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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      C Offline
      Christopher Duncan
      wrote on last edited by
      #7

      Frankly, I'd take both back to the merchant for replacement. Neither 7 minutes nor 4 minutes are anywhere near an hour. You were robbed. And while you're there getting the 60 minutes worth of sand per glass that you originally paid for, I'd spend a couple of extra bucks and get some minuteglasses while you're at it. In fact, you might even be able to get him to throw one in for free, for your trouble... Chistopher Duncan Author - The Career Programmer: Guerilla Tactics for an Imperfect World (Apress)

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      • C Chris Maunder

        You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

        J Offline
        J Offline
        Jon Newman
        wrote on last edited by
        #8

        Chris Maunder wrote: you want to measure 9 minutes, how do you do it? A watch...or that little clock in the bottom right of your screen. [edit]Now, can you stick your tongue out and touch your forhead?[/edit]


        "If you just say porn then you get all manner of chaff and low grade stuff."
        - Paul Watson, Lounge 25 Mar 03
        "If a man is standing in the middle of the forest speaking and there is no woman around to hear him, is he still wrong?"
        - Anon


        Jonathan 'nonny' Newman Homepage [www.nonny.com] [^]

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        • C Chris Maunder

          You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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          Marc Clifton
          wrote on last edited by
          #9

          I don't do your homework problems! :-D Marc Help! I'm an AI running around in someone's f*cked up universe simulator.
          Sensitivity and ethnic diversity means celebrating difference, not hiding from it. - Christian Graus
          Every line of code is a liability - Taka Muraoka
          Microsoft deliberately adds arbitrary layers of complexity to make it difficult to deliver Windows features on non-Windows platforms--Microsoft's "Halloween files"

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          • C Chris Maunder

            You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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            Daniel Turini
            wrote on last edited by
            #10

            Hehehe... Lots of free time and hourglass rolling on your screen... My latest article: GBVB - Converting VB.NET code to C#

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            • C Chris Maunder

              You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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              J Offline
              jhaga
              wrote on last edited by
              #11

              HG 7 you let go to end and turn it around. HG 4 turn at 4 min and at 8 min At 8 min you turn HG 7 again and let it run out = 9 min !! jhaga

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              • C Chris Maunder

                You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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                J Offline
                JoeSox
                wrote on last edited by
                #12

                go buy a 9 minute hourglass. :-D :jig::jig::jig: <that's logical.> Later,
                JoeSox
                www.humanaiproject.org "This life is more than just a read thru"[lyrics^] Can't Stop - Red Hot Chili Peppers

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                • J Jon Newman

                  Chris Maunder wrote: you want to measure 9 minutes, how do you do it? A watch...or that little clock in the bottom right of your screen. [edit]Now, can you stick your tongue out and touch your forhead?[/edit]


                  "If you just say porn then you get all manner of chaff and low grade stuff."
                  - Paul Watson, Lounge 25 Mar 03
                  "If a man is standing in the middle of the forest speaking and there is no woman around to hear him, is he still wrong?"
                  - Anon


                  Jonathan 'nonny' Newman Homepage [www.nonny.com] [^]

                  S Offline
                  S Offline
                  Steve Mayfield
                  wrote on last edited by
                  #13

                  Now, can you stick your tongue out and touch your forhead?

                  I can't - but Heidi Hamilton can - "a beautiful, blonde bomb shell with an 8-inch tongue". She is a Los Angeles radio "on air personality". Recently had a tongue-off with Kiss's Gene Simmons and won...here is the competition[^] Steve

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                  • C Chris Maunder

                    You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

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                    N Offline
                    Nick Parker
                    wrote on last edited by
                    #14

                    Chris Maunder wrote: You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it? Flip the 4 minute hourglass. When the 4 minute hourglass is halfway down, flip the 7 minute hourglass. Did I miss a better solution? -Nick Parker

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                    • N Nick Parker

                      Chris Maunder wrote: You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it? Flip the 4 minute hourglass. When the 4 minute hourglass is halfway down, flip the 7 minute hourglass. Did I miss a better solution? -Nick Parker

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                      jhaga
                      wrote on last edited by
                      #15

                      Measuring a 4 minute hourglass halfway down will give you an accuracy of +-10 sek. If you let it run to the end, it gives an accuracy of +-5 sek. (hourglass standardisation rfc-474) jhaga

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                      • S Steve Mayfield

                        Now, can you stick your tongue out and touch your forhead?

                        I can't - but Heidi Hamilton can - "a beautiful, blonde bomb shell with an 8-inch tongue". She is a Los Angeles radio "on air personality". Recently had a tongue-off with Kiss's Gene Simmons and won...here is the competition[^] Steve

                        J Offline
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                        Jon Newman
                        wrote on last edited by
                        #16

                        :omg::wtf::omg: I'll have to think twice before making that joke again


                        "If you just say porn then you get all manner of chaff and low grade stuff."
                        - Paul Watson, Lounge 25 Mar 03
                        "If a man is standing in the middle of the forest speaking and there is no woman around to hear him, is he still wrong?"
                        - Anon


                        Jonathan 'nonny' Newman Homepage [www.nonny.com] [^]

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                        • D Daniel Turini

                          Hehehe... Lots of free time and hourglass rolling on your screen... My latest article: GBVB - Converting VB.NET code to C#

                          J Offline
                          J Offline
                          John Honan
                          wrote on last edited by
                          #17

                          Nice article Daniel, although your link didn't work, I found it here: http://www.codeproject.com/csharp/GBVB.asp[^] I'm a VB.NET programmer, what I'd really like to see is a conversion / comparison chart of VB.NET versus C# I often find nice examples of things I need to do, but the code is in C#, and I have difficulty converting it to VB.NET! Things like, where to put the 'inherits' keyword, how to declare constructors, how 'namespace' is used in VB.NET, the structure of classes in VB.NET versus C#, how to declare functions/subs and parameters/return values in C# versus VB.NET I always get caught out by the 'reverse' way of declaring types in VB versus C++, e.g. in VB.NET you can say Dim myStr as String, in C# it's something like String myStr; (the other way around!) Okay, that's enough... I don't want to start a programming thread in the Lounge!... :-O John. www.silveronion.com[^]

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                          • J John Honan

                            Nice article Daniel, although your link didn't work, I found it here: http://www.codeproject.com/csharp/GBVB.asp[^] I'm a VB.NET programmer, what I'd really like to see is a conversion / comparison chart of VB.NET versus C# I often find nice examples of things I need to do, but the code is in C#, and I have difficulty converting it to VB.NET! Things like, where to put the 'inherits' keyword, how to declare constructors, how 'namespace' is used in VB.NET, the structure of classes in VB.NET versus C#, how to declare functions/subs and parameters/return values in C# versus VB.NET I always get caught out by the 'reverse' way of declaring types in VB versus C++, e.g. in VB.NET you can say Dim myStr as String, in C# it's something like String myStr; (the other way around!) Okay, that's enough... I don't want to start a programming thread in the Lounge!... :-O John. www.silveronion.com[^]

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                            J Offline
                            Jon Newman
                            wrote on last edited by
                            #18

                            John Honan wrote: in VB.NET you can say Dim myStr as String, in C# it's something like String myStr; Thats C++ based languages for you.* No silly keywords found here. *No lets not get into a discussion about what C++ is based on


                            "If you just say porn then you get all manner of chaff and low grade stuff."
                            - Paul Watson, Lounge 25 Mar 03
                            "If a man is standing in the middle of the forest speaking and there is no woman around to hear him, is he still wrong?"
                            - Anon


                            Jonathan 'nonny' Newman Homepage [www.nonny.com] [^]

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                            • C Chris Maunder

                              You have two hourglasses, one measures 7 minutes and the other measures 4 minutes, now you want to measure 9 minutes, how do you do it?

                              L Offline
                              L Offline
                              Lost User
                              wrote on last edited by
                              #19

                              Get 7 min and 4 min hourglass going. When the 4 min hourglass has ran out flip it over (we marked 4 min). When the 7 min hourglass has ran out flip over the 7 min hourglass (we no have a 7 min mark). Bear in mind that the 4 min hourglass will still run for another 1 min. When the 4 min hour glass has finnally run out flip 7 min hour glass at this instant (we marked 8 min). At this point the 7 min hourglass has only run for 1 min and by flipping it over again we will have it run out in exactly 1 min. Hence, the 8 + 1 = 9 min. Problem solved. Happy Coding :) Marat Kagetsya dogd' nashinaetsya :)

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                              • J Jon Newman

                                Chris Maunder wrote: you want to measure 9 minutes, how do you do it? A watch...or that little clock in the bottom right of your screen. [edit]Now, can you stick your tongue out and touch your forhead?[/edit]


                                "If you just say porn then you get all manner of chaff and low grade stuff."
                                - Paul Watson, Lounge 25 Mar 03
                                "If a man is standing in the middle of the forest speaking and there is no woman around to hear him, is he still wrong?"
                                - Anon


                                Jonathan 'nonny' Newman Homepage [www.nonny.com] [^]

                                P Offline
                                P Offline
                                Peter Hancock
                                wrote on last edited by
                                #20

                                Sure.... what do you want me to touch my forehead with? My left hand, or my right hand?:-D And they still ran faster and faster and faster, till they all just melted away, and there was nothing left but a great big pool of melted butter "I ask candidates to create an object model of a chicken." -Bruce Eckel

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