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  1. // sennkei list
  2.  
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5.  
  6. typedef struct node {
  7.     int val;
  8.     struct node *next;
  9. }Node;
  10.  
  11. Node *head = NULL;
  12.  
  13. Node* createN(int x){
  14.     Node *newnode;
  15.     newnode = (Node *)malloc(sizeof(Node));
  16.     newnode->val = x;
  17.     newnode->next = NULL;
  18.     return newnode;
  19. }
  20.  
  21. void initL(int n){
  22.     int x,i;
  23.     Node *p;
  24.     scanf("%d",&x);
  25.     head = createN(x);
  26.     p = head;
  27.     for(i=1;i<n;i++){
  28.         scanf("%d",&x);
  29.         p->next = createN(x);
  30.         p = p->next;
  31.     }
  32. }
  33.  
  34. void freeL(){
  35.     Node *p;
  36.     while(head!=NULL){
  37.         p = head->next;
  38.         free(head);
  39.         head = p;
  40.     }
  41. }
  42.  
  43. void printL(){
  44.     Node *p = head;
  45.     while(p != NULL){
  46.         printf("%d ",p->val);
  47.         p = p->next;
  48.     }
  49.     printf("\n");
  50. }
  51.  
  52.  
  53. void insTail(int x){
  54.     Node *p;
  55.     p = head;               // 1
  56.     while(p->next != NULL){ // 2
  57.         p = p->next;        // 2
  58.     }
  59.     p->next = createN(x);   // 3
  60. }
  61.  
  62. void delTail(){
  63.     Node *p;
  64.     p = head;                       // 1
  65.     while(p->next->next != NULL){   // 2
  66.         p = p->next;                // 2
  67.     }
  68.     free(p->next);                  // 3
  69.     p->next = NULL;                 // 4
  70. }
  71.  
  72.  
  73. int main(void){
  74.     int i,n,x1;
  75.     scanf("%d",&n);
  76.     initL(n);
  77.     printL();
  78.     scanf("%d",&x1);
  79.     insTail(x1);
  80.     printL();
  81.     delTail();
  82.     printL();
  83.     freeL();
  84.     return 0;
  85. }
  86.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/cAsmpG
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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