Thread: sort array of strings

  1. #1
    Musicman - Canora
    Join Date
    Aug 2005

    sort array of strings

    Hey guys just wondering if u know how to sort an array of strings without using qsort and all of those. I dont get how all the swapping works and so on?

  2. #2
    Math wizard
    Join Date
    Dec 2006
    All I can think of is to parse the strings until the null character is reached. That is, check to see if the given character has a value of 0. Once reached, use temporary strings (locally-defined would be one method) to store the contents. When done, write the strings in the order as you want. It's one method, but probably a lousy one.
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  3. #3
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    to compare strings - use strcmp
    to swap strings - strcpy (or if you can mange to build array of pointers to strings - just swap pointers)
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  4. #4
    Registered User ssharish2005's Avatar
    Join Date
    Sep 2005
    Cambridge, UK
    This is sample code snap which is used for sorting the array. Well, it just the compare and copy part of the whole sorting code. You should try using this code to build your whole sorting program.

         if( strcmp(str[i], str[j]) > 0)            

  5. #5
    Frequently Quite Prolix dwks's Avatar
    Join Date
    Apr 2005
    As vart was saying, if you pointers to strings (for example if the strings were dynamically allocated), you can just swap pointers.
    char *p;
    if(strcmp(str[i], str[j]) > 0) {
        p = str[i];
        str[i] = str[j];
        str[j] = p;
    Also see these pages for actual sorting algorithms.

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