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  1. #include <stdio.h>
  2.  
  3. typedef struct user user;
  4. typedef struct message message;
  5. struct message
  6. {
  7.     int id;
  8.     int user;
  9.     message *next;
  10.     message *firstm;
  11. };
  12.  
  13. struct user
  14. {
  15.     char name[10];
  16.     int id;
  17.     message *messages;
  18.     user *next;
  19. };
  20.  
  21. int main(void) {
  22. 	user users[4] = {
  23. 		{.name = {0} }
  24. 	};
  25. 	message msgs[4] = {{0}};
  26.  
  27. 	for (int i = 0; i < 4; i++) {
  28. 		msgs[i].firstm = &msgs[0];
  29. 		msgs[i].next = &msgs[i+1];
  30. 		msgs[i].id = i;
  31. 		users[i].messages = &msgs[0];
  32. 		users[i].next = &users[i+1];
  33. 	}
  34. 	msgs[4].next = NULL;
  35. 	users[4].next = NULL;
  36.  
  37.  
  38. 	user *temp = &users[0];
  39. 	for (message *firstme = temp->messages->firstm;
  40. 			firstme->next != NULL;
  41. 			firstme = firstme->next) {
  42. 		printf("%d \n", firstme->id );
  43. 	}
  44.  
  45. 	return 0;
  46. }
  47.  
Success #stdin #stdout 0s 2292KB
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Standard input is empty
stdout 
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https://ideone.com/oe1PWy
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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