Swap Function

This is a discussion on Swap Function within the C Programming forums, part of the General Programming Boards category; Can anyone tell me real quick and fast way to write a swap function for an array of unsigned characters. ...

  1. #1
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    Swap Function

    Can anyone tell me real quick and fast way to write a swap function for an array of unsigned characters. I have my entire assignment done but this part and I just don't get it....Anyone?

  2. #2
    Nit
    Nit is offline
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    Mar 2002
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    42
    Code:
    int i;
    int array[size];
    
    void swap(your parameters) {
              i = array[swapindex];
              array[swapindex] = newvalue;
              array[indextoswap] = i;
    }
    Basically just use a temporary unsigned integer to hold the value of the index that you are swapping with a new value. Is that your problem, or are you having problems passing the array to a function as a parameter?
    http://www.KBeutler.com

  3. #3
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
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    9,796
    >Can anyone tell me real quick and fast way to write a swap
    >function for an array of unsigned characters.
    Code:
    typedef unsigned char uchar;
    
    void swap ( uchar *x, uchar *y )
    {
      uchar temp = *x; 
      *x = *y;
      *y = temp;
    }
    The call to this function is
    swap ( &array[x], &array[y] );

    -Prelude
    My best code is written with the delete key.

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