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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 freeL(){
  20.     Node*p;
  21.     while(head!=NULL){
  22.         p=head->next;
  23.         free(head);
  24.         head=p;
  25.     }
  26. }
  27.  
  28. void printL(){
  29.     Node*p=head;
  30.     while(p!=NULL){
  31.         printf("%d ",p->val);
  32.         p=p->next;
  33.     }
  34.     printf("\n");
  35. }
  36.  
  37. void push(int x){
  38.     Node*newnode=createN(x);
  39.     newnode->next=head;
  40.     head=newnode;
  41. }
  42.  
  43. int pop(){
  44.     if(head==NULL)return 0;
  45.     Node*temp=head;
  46.     head=head->next;
  47.     free(temp);
  48.     return 0;
  49. }
  50.  
  51. void enqueue(int x){
  52.     Node*newnode=createN(x);
  53.     if(head==NULL){
  54.         head=newnode;
  55.     }else{
  56.         Node*p=head;
  57.         while(p->next!=NULL)p=p->next;
  58.         p->next=newnode;
  59.     }
  60. }
  61.  
  62. int dequeue(){
  63.     if(head==NULL)return 0;
  64.     Node*temp=head;
  65.     head=head->next;
  66.     free(temp);
  67.     return 0;
  68. }
  69.  
  70. int main(void){
  71.     int s1,s2,s3,q1,q2,q3;
  72.  
  73.     push(1);
  74.     push(2);
  75.     push(3);
  76.     s1=pop();
  77.     s2=pop();
  78.     s3=pop();
  79.     printf("%d %d %d\n",s1,s2,s3);
  80.  
  81.     enqueue(1);
  82.     enqueue(2);
  83.     enqueue(3);
  84.     q1=dequeue();
  85.     q2=dequeue();
  86.     q3=dequeue();
  87.     printf("%d %d %d\n",q1,q2,q3);
  88.  
  89.     freeL();
  90.     return 0;
  91. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/FpwYs1
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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