概述
/*----------------------------------预处理命令-----------------------------------------*/
#include
#include
#define LEN sizeof(struct student)
#define FORMAT "%ld,%f"
#define P_FORMAT "%ld %5.1fn"
#define Null 0
/*---------------------------------构造结构体------------------------------------------*/
struct student//构造一个结构体类型
{
long num;//学生学号
float score;//学生成绩
struct student *next;//存放下一节点地址的指针变量
};
int n = 0; //用于统计节点个数的全局变量
/*---------------------------------建立链表函数--------------------------------------- */
struct student *creat(void) //建立链表的函数
{
struct student *p1,*p2,*head;
n = 0;//头结点个数初始化为0
p2 = p1 = (struct student *)malloc(LEN);//开辟一个节点，并使p1、p2指向它
scanf(FORMAT,&p1->num,&p1 ->score);//对第一个节点赋值
head = Null;//将头指针初始化为Null
while (p1->num != 0)
{
n = n + 1; //统计节点个数
if (n == 1)
{
head = p1;//将第一个节点的地址发送给头指针
}
else
{
p2->next = p1;//将新开辟的节点的地址发给前一节点指针变量next
}
p2 = p1;//将p2指向表尾(当前链表的最后一个节点)
p1 = (struct student *)malloc(LEN);//再开辟一个新节点，使p1指向它
scanf(FORMAT,&p1->num,&p1 ->score);
}
p2->next = Null;//若新开辟的节点num=0,那么表尾节点的指针变量置为NULL
return (head);
}
/*-----------------------------------输出链表函数--------------------------------------- */
void print(struct student *head)//输出链表的函数
{
struct student *p;
printf("nnNOW,These %d record are:n",n);
if (head != Null) //判断头指针是否为空
{
p = head; //使p指第一个节点
do
{
printf(P_FORMAT,p->num,p->score);//输出p所指的节点的成员
p = p->next; //使p指向下一节点
}while (p != Null);
}
else
{
printf(" nlist Null!n");
}
return;
}
/*----------------------------------删除链表节点函数----------------------------------- */
struct student *del(struct student *head,long num)//删除链表节点的函数
{
struct student *p1,*p2;
if (head == Null) //判断头指针是否为空
{
printf("nlist Null!n");
}
else
{
p1 = head;
while (p1->num != num && p1->next != Null) //当p1所指节点不是要删除的节点以及不是表尾节点时，继续寻找。
{
p2 = p1;
p1 = p1->next;
}
if (p1->num == num)//判断p1是否是要删除的节点
{
if(p1 == head)//判断p1是否指向头结点
{
head = p1->next;
}
else
{
p2->next = p1->next;
}
printf("n%ld has been deletedn",num);
n=n-1;
}
else
{
printf("n%ld is not foud!n",num);
}
}
return (head);
}
/*----------------------------------增加链表节点函数----------------------------------- */
struct student *insert(struct student *head,struct student *stu)//插入链表节点的函数
{
struct student *p0,*p1,*p2;
p0 = stu; //使p0指向要插入的节点
if (head == Null) //判断链表是否为空
{
head = p0; //将p0所指的节点作为唯一节点
}
else
{
p1 = head; //使p1指向第一个节点
while (p1->num < p0->num && p1->next != Null)//当p1所指的节点成员num小于要插入的节点num以及p1所指的不是表尾节点，继续寻找
{
p2 = p1;
p1 = p1->next;
}
if (p0->num <= p1->num) //判断是否找到大于等于要插入的节点num的节点
{
if (p1 == head) //判断p1是否指向头结点
{
head = p0; //插到表头之前
p0->next = p1;
}
else
{
p2->next = p0; //插到表中间
p0->next = p1;
}
}
else //插到表尾之后
{
p1->next = p0;
p0->next = Null;
}
}
n = n + 1;
return (head);
}
/*----------------------------------主函数----------------------------------- */
int main(void)
{
struct student *stu,*head;
long del_num;
printf("Input record:n");
head = creat();//不能写成head = creat(void);
print(head);
printf("nInput the deleted number:");
scanf("%ld",&del_num);
while (del_num != 0)
{
head = del(head,del_num);
print(head);
printf("nInput the deleted number:");
scanf("%ld",&del_num);
}
printf("nInput the inserted record: ");
stu = (struct student*)malloc(LEN);
scanf(FORMAT,&stu->num, &stu->score);
while (stu->num != 0)
{
head = insert(head,stu);
print(head);
printf("nInput the inserted record: ");
stu = (struct student*)malloc(LEN);
scanf(FORMAT,&stu->num, &stu->score);
}
printf("The endn");
return 0;
}
/*在VC++6.0中的输出结果为：
------------------------------------------
Input record:
10101,90
10102,876
10103,87
10104,100
10105,82
10106,76
10107,92
10108,91
10109,76
10110,82
10111,988
0,0
NOW,These 11 record are:
10101 90.0
10102 876.0
10103 87.0
10104 100.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
10111 988.0
Input the deleted number:10102
10102 has been deleted
NOW,These 10 record are:
10101 90.0
10103 87.0
10104 100.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
10111 988.0
Input the deleted number:10104
10104 has been deleted
NOW,These 9 record are:
10101 90.0
10103 87.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
10111 988.0
Input the deleted number:10111
10111 has been deleted
NOW,These 8 record are:
10101 90.0
10103 87.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
Input the deleted number:0
Input the inserted record: 10102,81
NOW,These 9 record are:
10101 90.0
10102 81.0
10103 87.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
Input the inserted record: 10104,93
NOW,These 10 record are:
10101 90.0
10102 81.0
10103 87.0
10104 93.0
10105 82.0
10106 76.0
10107 92.0
10108 91.0
10109 76.0
10110 82.0
Input the inserted record: 0,0
The end
Press any key to continue
最后
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