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  1. #include<stdlib.h>
  2. #include<stdio.h>
  3.  
  4. typedef struct Point{
  5.     int x;
  6.     int y;
  7. }Point;
  8.  
  9. typedef struct Polygon{
  10.     int num_vertices;
  11.     Point *vertices;
  12. }Polygon;
  13.  
  14. void addPolygon(Polygon* ps, int n, int v){
  15.     int i;
  16.     for(i = 0; i<n; i++){
  17.         (ps+i)->vertices = malloc(sizeof(Point)*v);
  18.         (ps+i)->num_vertices = v;
  19.     }
  20. }
  21.  
  22. int main() {
  23.     int n1=5, n2=10, v1=3, v2=4;
  24.     //n1個v1邊形: 5個3邊形
  25.     //n2個v2邊形: 10個4邊形
  26.     int i;
  27.     Polygon* ps;
  28.     ps = malloc(sizeof(Polygon)*(n1+n2));
  29.     for(i = 0; i<n1+n2;i++){
  30.         if(i<n1){
  31.             (ps+i)->vertices = malloc(sizeof(Point)*v1);
  32.             (ps+i)->num_vertices = v1;
  33.         }
  34.         else{
  35.             (ps+i)->vertices = malloc(sizeof(Point)*v2);
  36.             (ps+i)->num_vertices = v2;
  37.         }
  38.     }
  39.  
  40.     for(i = 0; i<n1+n2;i++){
  41.         free((ps+i)->vertices);
  42.     }
  43.     free(ps);
  44.  
  45.     ps = malloc(sizeof(Polygon)*n1);
  46.     addPolygon(ps, n1, v1);
  47.     ps = realloc(ps, sizeof(Polygon)*(n1+n2));
  48.     addPolygon(ps+n1, n2, v2);
  49.     for(i = 0; i<n1+n2;i++){
  50.         free((ps+i)->vertices);
  51.     }
  52.     free(ps);
  53.  
  54.     return EXIT_SUCCESS;
  55. }
Success #stdin #stdout 0s 9424KB
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https://ideone.com/CIOf7f
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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