Passing array information between functions using a struct

Question

I'm struggling a bit with pointers. I'm trying to pass information between functions, but am getting the following error: "request for member ‘score’ in something not a structure or union", and the same error with 'index' instead of score (and for all other members I'm doing this for that are not listed here).

Here is my struct:

typedef struct line_t {
  char* buf;
  int lineLength;   
  int wordCount;
  int index;
  double score;
} line_t;

This is my call to the function in main (with declaration):

line_t bestmatch[TOP_SCORING_MAX];
func3(&line, &bestmatch[TOP_SCORING_MAX]);

Here is my function:

line_t
func3(line_t line, line_t *bestmatchPtr[]) {
    int i;

    for (i=0; i< TOP_SCORING_MAX; i++) { 

        if (line.score != 0) {

            if (i == 0) {

                bestmatchPtr[0].score = line.score;
                bestmatchPtr[0].index = line.index;

               /*more code here: rest of func, closing of }, etc*/

return bestmatchPtr;
}

Essentially, I need to pass information about bestmatch between functions, while keeping it ordered (my function is attempting to order information and retain only a set amount of data). I was wondering how to fix this error? Let me know if I'm missing some information.

Some compilers can't pass structures or return them. Try making the retutn value be line_t *, ditto for parameter line. Remember to derefence elements with the -> operator rather than . — phil
– phil, Commented Sep 23, 2014 at 10:33

manlio · Accepted Answer · 2014-09-23 10:41:12Z

3

func3 signature should be:

line_t *func3(line_t line, line_t *bestmatchPtr)
/* Changed: second argument and return type */

Also note that:

the last element of your array is bestmatch[TOP_SCORING_MAX - 1] (NOT bestmatch[TOP_SCORING_MAX])
the line argument is passed by value (&line is a pointer)

So this is wrong:

func3(&line, &bestmatch[TOP_SCORING_MAX]);

the function call should be:

func3(line, bestmatch);

edited Sep 23, 2014 at 10:41

answered Sep 23, 2014 at 10:21

manlio

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2 Comments

0xfee1dead Over a year ago

Also passing &line will be of type line_t* instead line_t, or not?

juanchopanza Over a year ago

i.e. the function call should be func3(line, bestmatch);

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