I have little question for you. How to sort some struct value. For example I have struct: struct base { char id[3]; char word[10]; } data[4]; Now I load some value to to data[(0 to 4)].id and some to data[(0 to 4)].word from some file. How to sort this by id - id is number but wrote in char(using atoi or something what's change char to int) that after sort when i type data[2].id - data[2].word - before data[4].id - data[4].word. Bouble sort? how?

#include <allegro.h>
#include <iostream>
#include <stdlib.h>
#include <fstream.h>
#include <string.h>

#define LIST 1
using namespace std;
struct base {
       char id[10];
       char word[10];
} data[10]; 

struct base2 {
       char id2[10];
       char word2[10];
} data2;

int number = 2;

void load()
{
     int i=0, j=0;
     ifstream file("file.txt");
     while(!file.eof())
     {
                       file >> data.id;
                       i++;
     }
     file.close();
     ifstream file2("file2.txt");
     while(!file2.eof())
     {
                       file2 >> data[j].word;
                       j++;
     }
     file2.close();
}

char *list1(int index, int *w_listy)
{
   if (index < 0) {
      *w_listy = 5;
      return NULL;
   }
   else
      return data[index].id; 
}
char *list2(int index, int *w_listy)
{
   if (index < 0) {
      *w_listy = 5;
      return NULL;
   }
   else
      return data[index].word; 
}

int sort11();

DIALOG dlg[] =
{
   /* (proc)        (x)  (y)  (w)  (h)  (fg) (bg) (key) (flags) (d1) (d2) (dp)           (dp2) (dp3) */
   { d_clear_proc,  0,   472, 32,  8,   0,   0,   0,    0,      0,   0,   NULL,          NULL, NULL },
   { d_list_proc,   184, 128, 120, 216, 0,   65535,   0,    0,      0,   0,   (void*)list1,  NULL, NULL },
   { d_list_proc,   360, 128, 120, 216, 0,   65535,   0,    0,      0,   0,   (void*)list2,  NULL, NULL },
   { d_button_proc, 264, 408, 144, 32,  0,   65535,   0,    D_EXIT, 0,   0,   (void*)"Exit", NULL, NULL },
   { d_button_proc, 264, 360, 144, 32,  0,   65535,   0,    0, 0,   0,   (void*)data[number].id, NULL, NULL },
   { NULL,          0,   0,   0,   0,   0,   0,   0,    0,      0,   0,   NULL,          NULL, NULL }
};


int myCompareByWord( const void *obj1, const void *obj2 ) {
   base *base1 = (base *) obj1;
   base *base2 = (base *) obj2;
   return strcmp( base1->word, base2->word );
}

int myCompareById( const void *obj1, const void *obj2 ) {
   base *base1 = (base *) obj1;
   base *base2 = (base *) obj2;
   return strcmp( base1->id, base2->id );
}

int main(void)
{
   if (allegro_init() != 0)
      return 1;
   install_keyboard(); 
   install_mouse();
   install_timer();
   set_color_depth(16);
   set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0);
   show_mouse(screen);

   load();


// Sort a list of elements by name (10 elements) // 
qsort( data, 10, sizeof( base ), myCompareByWord );

   
   do_dialog(dlg, -1);

   return 0;
}

END_OF_MAIN()

And this file is:

//file.txt
3
4
2
1
5
//file2.txr
three
four
two
one
five

Why program show me nothing after sort?

What does it show you if you leave out the call to qsort?