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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. typedef struct Data_ {
  5.     int x,y,z;
  6.     // ...
  7. } Data;
  8.  
  9. typedef struct Array_ {
  10.     Data * data;
  11.     int    size;
  12.     int    reserved;
  13. } Array;
  14.  
  15. Array* makeArray(int startSize)
  16. {
  17.     Array * a = malloc(sizeof(Array));
  18.     a->data = malloc(sizeof(Data)*startSize);
  19.     a->reserved = startSize;
  20.     a->size = 0;
  21.     return a;
  22. };
  23.  
  24. void killArray(Array * a)
  25. {
  26.     free(a->data);
  27.     free(a);
  28. }
  29.  
  30.  
  31. Data * getData(Array* a)
  32. {
  33.     return a->data;
  34. }
  35.  
  36. int sizeData(Array* a)
  37. {
  38.     return a->size;
  39. }
  40.  
  41. void addData(Array* a, Data d)
  42. {
  43.     if (a->size == a->reserved) // Full
  44.     {
  45.         a->data = realloc(a->data,sizeof(Data)*a->reserved*2);
  46.         a->reserved *= 2;
  47.     }
  48.     a->data[a->size++] = d;
  49. }
  50.  
  51.  
  52. int main(int argc, const char * argv[])
  53. {
  54.     int i;
  55.     Array * a = makeArray(2);
  56.     for(i = 0; i < 20; ++i)
  57.     {
  58.         Data d;
  59.         d.x = i;
  60.         d.y = 2*i;
  61.         d.z = 3*i;
  62.         addData(a,d);
  63.     }
  64.     for(i = 0; i < sizeData(a); ++i)
  65.     {
  66.         printf("%3d %3d %3d\n",getData(a)[i].x,getData(a)[i].y,getData(a)[i].z);
  67.     }
  68.  
  69.     killArray(a);
  70.  
  71.     return 0;
  72. }
  73.  
  74.  
Success #stdin #stdout 0s 2292KB
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stdin
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Standard input is empty
stdout
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  0   0   0
  1   2   3
  2   4   6
  3   6   9
  4   8  12
  5  10  15
  6  12  18
  7  14  21
  8  16  24
  9  18  27
 10  20  30
 11  22  33
 12  24  36
 13  26  39
 14  28  42
 15  30  45
 16  32  48
 17  34  51
 18  36  54
 19  38  57
https://ideone.com/gxuyBj
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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