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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. typedef struct node{
  6.     void *value;
  7.     unsigned index;
  8.     struct node *next;
  9. }node;
  10.  
  11. typedef struct{
  12.     unsigned count;
  13.     node *head;
  14. }list;
  15.  
  16. typedef struct{
  17.     char name[15];
  18. }car;
  19.  
  20. typedef struct{
  21.     char name[10];
  22.     char surname[20];
  23. }person;
  24.  
  25. void add(list *list, void *value){
  26.     node* newNode = (node*)malloc(sizeof(node));
  27.     newNode->value = value;
  28.     newNode->next = list->head;
  29.     newNode->index = list->count;
  30.  
  31.     list->head = newNode;
  32.     list->count += 1;
  33. }
  34.  
  35. void* get(list *list, unsigned index){
  36.     node* temp;
  37.     for(temp = list->head; temp != NULL; temp = temp->next)
  38.         if(temp->index == index) return temp->value;
  39.     return NULL;
  40. }
  41.  
  42. void erase(list *list){
  43.     while(list->head){
  44.         node *next = list->head->next;
  45.         free(list->head->value);
  46.         free(list->head);
  47.         list->head = next;
  48.     }
  49. }
  50.  
  51. void printPerson(const person* person){
  52.     printf("Selected Person:\nName: %s\nSurname: %s\n", person->name, person->surname);
  53. }
  54.  
  55. void printCar(const car* car){
  56.     printf("Selected Car:\nName: %s\n", car->name);
  57. }
  58.  
  59. int main(){
  60.     list list = { 0, NULL };
  61.     car *cars[] = { (car*)malloc(sizeof(car)), (car*)malloc(sizeof(car)) };
  62.     strcpy(cars[0]->name, "Mercedes");
  63.     strcpy(cars[1]->name, "Audi");
  64.  
  65.     person *persons[] = { (person*)malloc(sizeof(person)), (person*)malloc(sizeof(person)) };
  66.     strcpy(persons[0]->name, "Grzegorz");
  67.     strcpy(persons[0]->surname, "Igrekowski");
  68.     strcpy(persons[1]->name, "Karolina");
  69.     strcpy(persons[1]->surname, "Iksinska");
  70.  
  71.     unsigned i = 0;
  72.     for(; i < sizeof(cars) / sizeof(cars[0]); ++i) add(&list, cars[i]);
  73.     for(i = 0; i < sizeof(persons) / sizeof(persons[0]); ++i) add(&list, persons[i]);
  74.  
  75.     printCar((car*)get(&list, 0));
  76.     printPerson((person*)get(&list, 2));
  77.     erase(&list);
  78.  
  79.     return 0;
  80. }
  81.  
Success #stdin #stdout 0s 2292KB
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stdin
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Standard input is empty
stdout
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Selected Car:
Name: Mercedes
Selected Person:
Name: Grzegorz
Surname: Igrekowski
https://ideone.com/WQ3Msk
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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