Thread: input from text using structures

For the integers, you could put a pointer to an int in the structure and from the number obtained from the file then dynamically allocate an array of that size.

Well, I'd use char arrays for those structure elements if their size was within a known limit.

Right, like I said before:

Code:

struct salesData
{
   char city[10];
   char company[15];
   char name[20];
   int *value; /* size TBD at runtime */
};

then i would make the structure read the strings lke this

Code:

struct salesData sales = {"", "",  ""};

so i would just skip the interger at first and make a function read the pointer

Time to tell us which way it is: you have a static structure with a compile-time definition and initialization, or you have a dynamic structure that is populated at run-time. If it's at run-time which I have assumed thus far, then the compile-time example is not terribly relevant.

i believe dynamic structue at run-time. it's just got confusing when the i was typing the code in and can't get it read to the intergers when i run the program.

Code:

struct salesData
{
   char city[10];
   char company[15];
   char name[20];
   int *value; /* size TBD at runtime */
};

Code:

struct salesData sales = {"", "", x, x, x, x, ""};

What I am trying to accomplish is to have the values displayed in the location of the 'x' of struct line of code. The text file is already created and stored in the same directory as the program. Its a matter of printing it as if it weren't defined variables.

The display is supposed to print to the screen as -

Boston Starlite 300 410 400 600 JimRussel
Michigan 3Dlabs 200 120 150 300 StephenWilliams
Michigan Albros 400 420 510 550 BillCarter

Break things into smaller steps. If you had two integers for the first line of the file such as count and sales, you might have this:

Code:

      if ( fscanf(file, "%d %d%*c", &count, &sales) == 2 )

Then you might make a dynamic array of such records...

Code:

         struct salesData *rec = malloc(count * sizeof *rec);

And then within each line you might read it something like this (between reading the first two strings and the last one)...

Code:

               rec[i].value = malloc(sales * sizeof rec[i].value);
               if ( !rec[i].value )
               {
                  return 0; /* better cleanup should be done */
               }
               for ( j = 0; j < sales; ++j )
               {
                  if ( fscanf(file, "%d", &rec[i].value[j]) != 1 )
                  {
                     return 0; /* better cleanup should be done */
                  }
                  printf("%d\n", rec[i].value[j]);
               }

I'm sorry, I'm just trying to help you with your assignment -- not do it for you. Are you asking me to stop?