链表的创建、打印、插入和删除

拉玛 · 发表于 2016-6-21 10:33:09

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本帖最后由～风介～于 2016-6-21 19:55 编辑

#include"stdafx.h"
#include"malloc.h"
#include "iostream"
using namespace std;
#define LEN sizeof(struct student)
struct student *creat(); //创建链表
void print(struct student *head); //打印链表
struct student *del(struct student *head); //删除链表
struct student *insert(struct student *head, struct student *stu_2); //插入链表
int n; //记录学生人数
struct student
{
int num;
float score;
struct student *next;
};
void main() //主函数
{
struct student *stu, *p, *stu_2;
stu_2 = NULL;
stu = creat();
p = stu;
print(p);
print(insert(p, stu_2));
print(del(p));
/*
print(creat());
print(del(creat()));*/ //这样写之所以不对，是因为相当于由重新执行了一次creat(),所以应先把creat(）赋给一个指针变量。
cout << "\n\n";
system("PAUSE");
}
/********************************创建链表**************************************/
struct student *creat()
{
struct student *p1, *p2;
struct student *head;
p1 = p2 = (struct student *)malloc(LEN);
cout << "the number of studnt is:";
cin >> p1->num;
cout << "the score is:";
cin >> p1->score;
head = NULL;
n = 0;
while (p1->num)
{
n++;
if (1 == n)
{
head = p1; //链头
}
else
{
p2->next = p1;
}
p2 = p1;
p1 = (struct student *)malloc(LEN);//重新给p1开辟内存空间
cout << "the number of student is:";
cin >> p1->num;
cout << "the score is:";
cin >> p1->score;
}
p2->next = NULL;
return head;
}
/******************************打印数据**********************************/
void print(struct student *head)
{
struct student *p;
p = head;
cout << "There are " << n << " records" << endl;
/*if (NULL != head)
{
do
{
cout << "The score of " << p->num << " is " << p->score << endl;
p = p->next; //此处需要注意p指向下一个地址
} while (NULL != p);
}*/
for(;p!=NULL;p=p->next)
cout << "The score of " << p->num << " is " << p->score << endl;
}
/****************************************删除数据**************************************/
struct student *del(struct student *head)
{
struct student *p1, *p2;
int num;
p1 = p2 = head;
cout << "please inpute the delete num: ";
cin >> num;
if (head==NULL)
{
cout << "\nThere is no records!" << endl;
goto end;
}
p1 = head;
while (p1->num != num && p1->next != NULL)
{
p2 = p1;
p1 = p1->next;
}
if (num == p1->num)
{
if (p1 == head)
{
head = p1->next;
}
else
{
p2->next = p1->next;
}
cout << "Delete No: " << num << " succeed!" << endl;
n = n - 1;
}
else
{
cout<<num<<" not been found!\n";
}
end:
return head;
}
/************************************插入数据*******************************************/
struct student *insert(struct student *head, struct student *stu_2)
{
struct student *p1, *p2;
stu_2 = (struct student *)malloc(LEN);
/*为插入的数据赋值*/
cout << "The number of insert student is: " ;
cin >> stu_2->num ;
cout << "The score of insert student is: ";
cin >> stu_2->score;
p1 = p2 = head;
if (head == NULL)
{
stu_2 = head;
stu_2->next = NULL;
}
else
{
while (p1->next != NULL&&stu_2->num > p1->num)
{
p2 = p1;
p1 = p1->next;
}
if (stu_2->num <= p1->num)
{
if (head == p1)
{
head = stu_2;
stu_2->next = p1;
}
else
{
p2->next = stu_2;
stu_2->next = p1;
}
}
else
{
p1->next = stu_2;
stu_2->next = NULL;
}
}
n++;
cout << "The insert num is: " << stu_2->num << endl;
return head;
}

复制代码

～风介～ · 发表于 2016-6-21 19:57:27

这是我写的，可以交流下哦！

http://bbs.fishc.com/thread-46760-1-1.html

第二人生 · 发表于 2016-6-22 01:18:40

好好好好

第二人生 · 发表于 2016-6-22 01:19:11

好好好

学习电脑 · 发表于 2016-6-22 10:37:19

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[萌新报道] 链表的创建、打印、插入和删除

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