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C語言實(shí)現(xiàn)的循環(huán)單鏈表功能示例

來源：本站原創(chuàng)|時(shí)間：2020-01-10|欄目：C語言|點(diǎn)擊： 次

本文實(shí)例講述了C語言實(shí)現(xiàn)的循環(huán)單鏈表功能。分享給大家供大家參考，具體如下：

SClist.h

#ifndef __SCLIST_H__
#define __SCLIST_H__
#include<cstdio>
#include<malloc.h>
#include<assert.h>
typedef int ElemType;
typedef struct Node {
  ElemType data;
  struct Node *next;
}Node,*PNode;
typedef struct List {
  PNode first;
  PNode last;
  size_t size;
}List;
void InitSClist(List *list);//初始化循環(huán)單鏈表
void push_back(List *list, ElemType x);//在循環(huán)單鏈表的末尾插入元素
void push_front(List *list, ElemType x);//在循環(huán)單鏈表的頭部插入元素
void show_list(List *list);//打印循環(huán)單鏈表
void pop_back(List *list);//刪除循環(huán)單鏈表的最后一個(gè)元素
void pop_front(List *list);//刪除循環(huán)單鏈表的第一個(gè)元素
void insert_val(List *list, ElemType val);//將數(shù)據(jù)元素插入到循環(huán)單鏈表中（要求此時(shí)循環(huán)單鏈表中的數(shù)據(jù)元素順序排列）
Node* find(List *list, ElemType x);//查找循環(huán)單鏈表中數(shù)據(jù)值為x的結(jié)點(diǎn)
int length(List *list);//求循環(huán)單鏈表的長度
void delete_val(List *list, ElemType x);//按值刪除循環(huán)單鏈表中的某個(gè)數(shù)據(jù)元素
void sort(List *list);//對(duì)循環(huán)單鏈表進(jìn)行排序
void reverse(List *list);//逆置循環(huán)單鏈表
void clear(List *list);//清除循環(huán)單鏈表
void destroy(List *list);//摧毀循環(huán)單鏈表
//優(yōu)化
Node* _buynode(ElemType x);//創(chuàng)建結(jié)點(diǎn)
#endif

SClist.cpp

#include"SClist.h"
Node* _buynode(ElemType x) {
  Node *s = (Node*)malloc(sizeof(Node));
  assert(s != NULL);
  s->data = x;
  s->next = NULL;
  return s;
}
void InitSClist(List *list) {
  Node *s = (Node*)malloc(sizeof(Node));
  assert(s != NULL);
  list->first = list->last = s;
  list->last->next = list->first;//讓鏈表最后一個(gè)結(jié)點(diǎn)的指針域指向頭結(jié)點(diǎn)，從而時(shí)鏈表循環(huán)
  list->size = 0;
}
void push_back(List *list, ElemType x) {
  Node *s = _buynode(x);
  list->last->next = s;
  list->last = s;
  list->last->next = list->first;
  list->size++;
}
void push_front(List *list, ElemType x) {
  Node *s = _buynode(x);
  s->next = list->first->next;
  list->first->next = s;
  if (list->last == list->first)
    list->last = s;
  list->size++;
}
void show_list(List *list) {
  Node *p = list->first->next;
  while (p != list->first) {
    printf("%d->", p->data);
    p = p->next;
  }
  printf("Nul.\n");
}
void pop_back(List *list) {
  if (list->size == 0) return;
  Node *p = list->first;
  while (p->next != list->last)
    p = p->next;
  free(list->last);
  list->last = p;
  list->last->next = list->first;
  list->size--;
}
void pop_front(List *list) {
  if (list->size == 0) return;
  Node *p = list->first->next;
  list->first->next = p->next;
  if (list->size == 1)
    list->last = list->first;
  free(p);
  list->size--;
}
void insert_val(List *list, ElemType x) {
  Node *p = list->first;
  while (p->next != list->last && p->next->data < x)
    p = p->next;
  if (p->next == list->last && p->next->data < x)
    push_back(list, x);
  else {
    Node *s = _buynode(x);
    s->next = p->next;
    p->next = s;
    list->size++;
  }
}
Node* find(List *list, ElemType key) {
  if (list->size == 0) return NULL;
  Node *p = list->first->next;
  while(p != list->first && p->data != key)
    p = p->next;
  if (p == list->first)
    return NULL;
  return p;
}
int length(List *list) {
  return list->size;
}
void delete_val(List *list, ElemType x) {
  if (list->size == 0) return;
  Node *p = find(list, x);
  if (p == NULL) {
    printf("沒有要?jiǎng)h除的數(shù)據(jù)!\n");
    return;
  }
  if (p == list->last)
    pop_back(list);
  else {
    Node *q = p->next;
    p->data = q->data;
    p->next = q->next;
    free(q);
    list->size--;
  }
}
void sort(List *list) {
  if (list->size == 0 || list->size == 1) return;
  Node *s = list->first->next;
  Node *q = s->next;
  list->last->next = NULL;
  list->last = s;
  list->last->next = list->first;
  while (q != NULL) {
    s = q;
    q = q->next;
    Node *p = list->first;
    while (p->next != list->last && p->next->data < s->data)
      p = p->next;
    if (p->next == list->last &&p->next->data < s->data) {
      list->last->next = s;
      list->last = s;
      list->last->next = list->first;
    }
    else {
      s->next = p->next;
      p->next = s;
    }
  }
}
void reverse(List *list) {
  if (list->size == 0 || list->size == 1) return;
  Node *p = list->first->next;
  Node *q = p->next;
  list->last->next = NULL;
  list->last = p;
  list->last->next = list->first;
  while (q != NULL) {
    p = q;
    q = q->next;
    p->next = list->first->next;
    list->first->next = p;
  }
}
void clear(List *list) {
  Node *p = list->first->next;
  while (p != list->first) {
    list->first->next = p->next;
    free(p);
    p = list->first->next;
  }
  list->last = list->first;
  list->last->next = list->first;
  list->size = 0;
}
void destroy(List *list) {
  clear(list);
  free(list->first);
  list->first = list->last = NULL;
}

main.cpp

#include"SClist.h"
void main() {
  List mylist;
  InitSClist(&mylist);
  ElemType item;
  Node *p = NULL;
  int select = 1;
  while (select) {
    printf("*******************************************\n");
    printf("*[1] push_back    [2] push_front  *\n");
    printf("*[3] show_list    [4] pop_back   *\n");
    printf("*[5] pop_front    [6] insert_val  *\n");
    printf("*[7] find       [8] length    *\n");
    printf("*[9] delete_val    [10] sort     *\n");
    printf("*[11] reverse     [12] clear     *\n");
    printf("*[13*] destroy     [0] quit_system  *\n");
    printf("*******************************************\n");
    printf("請(qǐng)選擇：>>");
    scanf("%d", &select);
    if (select == 0) break;
    switch (select) {
    case 1:
      printf("請(qǐng)輸入要插入的數(shù)據(jù)（-1結(jié)束）:>");
      while (scanf("%d", &item), item != -1) {
        push_back(&mylist, item);
      }
      break;
    case 2:
      printf("請(qǐng)輸入要插入的數(shù)據(jù)（-1結(jié)束）:>");
      while (scanf("%d", &item), item != -1) {
        push_front(&mylist, item);
      }
      break;
    case 3:
      show_list(&mylist);
      break;
    case 4:
      pop_back(&mylist);
      break;
    case 5:
      pop_front(&mylist);
      break;
    case 6:
      printf("請(qǐng)輸入要插入的數(shù)據(jù):>");
      scanf("%d", &item);
      insert_val(&mylist, item);
      break;
    case 7:
      printf("請(qǐng)輸入要查找的數(shù)據(jù):>");
      scanf("%d", &item);
      p = find(&mylist, item);
      if (p == NULL)
        printf("要查找的數(shù)據(jù)在單鏈表中不存在！\n");
      break;
    case 8:
      printf("單鏈表的長度為%d\n", length(&mylist));
      break;
    case 9:
      printf("請(qǐng)輸入要?jiǎng)h除的值:>");
      scanf("%d", &item);
      delete_val(&mylist, item);
      break;
    case 10:
      sort(&mylist);
      break;
    case 11:
      reverse(&mylist);
      break;
    case 12:
      clear(&mylist);
      break;
      //case 13:
      //destroy(&mylist);
      //break;
    default:
      printf("選擇錯(cuò)誤,請(qǐng)重新選擇！\n");
      break;
    }
  }
  destroy(&mylist);
}

希望本文所述對(duì)大家C語言程序設(shè)計(jì)有所幫助。

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