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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct link {
  5.   struct link *next;
  6. };
  7.  
  8. struct link *link(struct link *next) {
  9.   struct link *node = malloc(sizeof *node);
  10.   if (node) {
  11.     node->next = next;
  12.   }
  13.   return node;
  14. }
  15.  
  16. struct link *append(struct link ***tail) {
  17.   struct link *node = link(**tail);
  18.   if (link) {
  19.     **tail = link(**tail);
  20.     *tail = &(**tail)->next;
  21.   }
  22.   return node;
  23. }
  24.  
  25. size_t length(struct link *node) {
  26.   size_t length = 0;
  27.   while (node) {
  28.     length += 1;
  29.     node = node->next;
  30.   }
  31.   return length;
  32. }
  33.  
  34. int main() {
  35.   struct link *list = NULL;
  36.   struct link **tail = &list;
  37.  
  38.   if (append(&tail) && append(&tail) && append(&tail)) {
  39.     printf("%zu\n", length(list));
  40.   }
  41.   return 0;
  42. }
Success #stdin #stdout 0.02s 1852KB
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https://ideone.com/nVSdt
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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