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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. // 假設 element 是 int
  5. typedef int element;
  6.  
  7. typedef struct node* node_pointer;
  8. typedef struct node {
  9.     node_pointer llink;
  10.     element item;
  11.     node_pointer rlink;
  12. } node;
  13.  
  14. int main() {
  15.     // 建立一個節點並讓它成為環狀（自己接自己）
  16.     node_pointer ptr = (node_pointer)malloc(sizeof(node));
  17.     ptr->item = 42;
  18.     ptr->llink = ptr;
  19.     ptr->rlink = ptr;
  20.  
  21.     // 驗證這兩行是否可行
  22.     ptr = ptr->rlink->llink;
  23.     ptr = ptr->llink->rlink;
  24.  
  25.     printf("ptr->item = %d\n", ptr->item); // 應該還是 42
  26.  
  27.     free(ptr);
  28.     return 0;
  29. }
Success #stdin #stdout 0s 5288KB
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Standard input is empty
stdout
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ptr->item = 42
https://ideone.com/U1aEYS
language:
C (gcc 8.3)
created:
13 days ago
visibility:
public

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