Thread: Need a C program for the following question

  1. #1
    Registered User
    Join Date
    Nov 2012

    Smile Need a C program for the following question

    You have ten boxes, each of which contains nine balls. The balls in one box each weigh 0.9pounds;the balls in all the other boxes weigh exactly one pound each. You have an accurate scale in front of you, with which you can determine the exact weight, in pounds, of any given set of balls. How can you determine which of the ten boxes contains the lighter balls with only one weighing ?

  2. #2
    Join Date
    Dec 2007
    That's not how it works around here.

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  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    This seems a math problem in logical thinking, rather than a programming problem.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  4. #4
    Registered User
    Join Date
    Jun 2009
    Take 1 ball from box #1,
    take 2 balls from box #2,
    take no balls from box #10.
    Put all 45 balls on the scale.

    If the fractal part of total weight is:
    .0 : found box #10
    .1 : found box #9
    .9 : found box #1

    Now try to write the program on your own, paste the code and ask some questions if you will have any.

  5. #5
    Join Date
    Dec 2007
    This is a typical interview question, and not usually code-related.

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