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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct node {
  5.     int val;
  6.     struct node *next;
  7. }Node;
  8.  
  9. Node *head = NULL;
  10.  
  11. Node* createN(int x){
  12.     Node *newnode;
  13.     newnode = (Node *)malloc(sizeof(Node));
  14.     newnode->val = x;
  15.     newnode->next = NULL;
  16.     return newnode;
  17. }
  18.  
  19. void initL(int n){
  20.     int x,i;
  21.     Node *p;
  22.     scanf("%d",&x);
  23.     head = createN(x);
  24.     p = head;
  25.     for(i=1;i<n;i++){
  26.         scanf("%d",&x);
  27.         p->next = createN(x);
  28.         p = p->next;
  29.     }
  30. }
  31.  
  32. void freeL(){
  33.     Node *p;
  34.     while(head!=NULL){
  35.         p = head->next;
  36.         free(head);
  37.         head = p;
  38.     }
  39. }
  40.  
  41. void printL(){
  42.     Node *p = head;
  43.     while(p != NULL){
  44.         printf("%d ",p->val);
  45.         p = p->next;
  46.     }
  47.     printf("\n");
  48. }
  49.  
  50.  
  51. void insHead(int x){
  52.     Node *p;        // 1
  53.     p = createN(x); // 1
  54.     p->next = head; // 2
  55.     head = p;       // 3
  56. }
  57.  
  58. void delHead(){
  59.     Node *p;
  60.     p = head;           // １
  61.     head = head->next;  // ２
  62.     free(p);            // ３
  63. }
  64.  
  65.  
  66. int main(void){
  67.     int i,n,x1;
  68.     scanf("%d",&n);
  69.     initL(n);
  70.     printL();
  71.     scanf("%d",&x1);
  72.     insHead(x1);
  73.     printL();
  74.     delHead();
  75.     printL();
  76.     freeL();
  77.     return 0;
  78. }
  79.  
Success #stdin #stdout 0s 5284KB
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https://ideone.com/gsOZ0O
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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