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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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    D Offline
    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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        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] [^]

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          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#

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                  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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                    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?

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                      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] [^]

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                        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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