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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. struct linked_node
  6. {
  7.     void* data;
  8.     struct linked_node* next;
  9. };
  10.  
  11. struct data_x { int i; char c; };
  12. struct data_y { char* s; };
  13.  
  14. void add_node(struct linked_node** a_head, void* a_data)
  15. {
  16.     struct linked_node* new_node = malloc(sizeof(*new_node));
  17.     new_node->data = a_data;
  18.     new_node->next = 0;
  19.     if (!*a_head)
  20.     {
  21.         *a_head = new_node;
  22.     }
  23.     else
  24.     {
  25.         /* ... */
  26.     }
  27. }
  28.  
  29. int main(void)
  30. {
  31.     struct linked_node* list_x = 0;
  32.     struct data_x* dx = malloc(sizeof(*dx));
  33.     dx->i = 4;
  34.     dx->c = 'a';
  35.  
  36.     add_node(&list_x, dx);
  37.  
  38.     if (list_x)
  39.     {
  40.         struct data_x* x = list_x->data;
  41.         printf("x.i=%d x.c=%c\n", x->i, x->c);
  42.     }
  43.  
  44.     struct linked_node* list_y = 0;
  45.     struct data_y* dy = malloc(sizeof(*dy));
  46.     dy->s = "hello";
  47.  
  48.     add_node(&list_y, dy);
  49.  
  50.     if (list_y)
  51.     {
  52.         struct data_y* y = list_y->data;
  53.         printf("y.s=%s\n", y->s);
  54.     }
  55.  
  56.     return 0;
  57. }
  58.  
Success #stdin #stdout 0.01s 1808KB
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stdin
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Standard input is empty
stdout
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x.i=4 x.c=a
y.s=hello
https://ideone.com/iZO8h
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

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