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  1. #include <stdio.h>
  2.  
  3. struct node {
  4. 	char data[3];
  5. 	struct node *next;
  6. };
  7.  
  8. void swap(struct node **p0_next) {
  9. 	struct node *p1 = *p0_next;
  10. 	struct node *p2 = p1->next;
  11. 	struct node *tmp = *p0_next;
  12.  
  13. 	*p0_next = p1->next;
  14. 	p1->next = p2->next;
  15. 	p2->next = tmp;
  16. }
  17.  
  18. void print_list(struct node *cursor) {
  19. 	for (; cursor != NULL; cursor = cursor->next) {
  20. 		printf("[%s] -> ", cursor->data);
  21. 		if (cursor->next == NULL) {
  22. 			printf("[NULL]\n");
  23. 		}
  24. 	}
  25. }
  26.  
  27. int main(void) {
  28. 	struct node list[5] = {
  29. 		{ "p0", list + 1 },
  30. 		{ "p1", list + 2 },
  31. 		{ "p2", list + 3 },
  32. 		{ "p3", NULL }
  33. 	};
  34.  
  35. 	print_list(list);
  36. 	swap(&list[0].next);
  37. 	print_list(list);
  38.  
  39. 	return 0;
  40. }
  41.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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[p0] -> [p1] -> [p2] -> [p3] -> [NULL]
[p0] -> [p2] -> [p1] -> [p3] -> [NULL]
https://ideone.com/lOA8xf
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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