Thread: fibonacci number help

  1. 08-24-2009 #1
    anirban
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    Anirban Ghosh
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    fibonacci number help

    i want to evaluate fibonacci numbers using the Closed form expression given in wiki

    http://upload.wikimedia.org/math/9/6...9a765ce708.png

    i tried using this...

    Code:
    double result;

result =  ( pow(GOLDEN_RATIO,n) - pow(1-GOLDEN_RATIO,n) ) /sqrt(5);
printf("%f \n", result);
    but its not working! what shall i do?
  2. 08-24-2009 #2
    tabstop
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    How did you #define GOLDEN_RATIO?
  3. 08-24-2009 #3
    King Mir
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    You will need to round the result the the nearest integer. Floating point has finite precision, and may not give 100% precise results.
    Last edited by King Mir; 08-24-2009 at 07:50 PM.
    It is too clear and so it is hard to see.
    A dunce once searched for fire with a lighted lantern.
    Had he known what fire was,
    He could have cooked his rice much sooner.
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