implement hash program

This is a discussion on implement hash program within the C Programming forums, part of the General Programming Boards category; Can any one suggest just to get me started, how I can implement a hash function that takes a string ...

  1. #1
    Registered User
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    Smile implement hash program

    Can any one suggest just to get me started, how I can implement
    a hash function that takes a string and returns a fixed length of that string ? just a big picture ....

  2. #2
    Code Goddess Prelude's Avatar
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    >just a big picture ....
    Big picture, huh? Well then, here's a decent hash function that works well for minimizing collisions.
    Code:
    int hash ( char *hashStr, int tableSize )
    {
      int hashValue = 0, index,
          x = 31415, y = 27183;
      for ( index = 0; hashStr[index] != '\0'; index++ ) {
        hashValue = ( x * hashValue + (int)hashStr[index] ) % tableSize;
        x = x * y % ( tableSize - 1 );
      }
      return hashValue;
    }
    -Prelude
    My best code is written with the delete key.

  3. #3
    Registered User stautze's Avatar
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    Wouldn't it be x = 31416?
    'During my service in the United States Congress, I took the initiative in creating the Internet.' - Al Gore, March 9, 1999: On CNN's Late Edition

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