Question

C语言链表中如何实现对一组数据进行排序？

比如用链表输入几个学生数据后要按学号升序排序，怎样实现？？

Answer 1

#include<stdio.h>
#include<stdlib.h>
#define NULL 0
struct student * creat();
struct student * link(struct student * head_a,struct student * head_b);
void print(struct student * head);
struct student{
int num;
float score[2];
struct student *next;
}stu;
int main(void)
{
struct student *head_a;
struct student *head_b,*head_c;
printf("请输入a链表学生的数据：0 0 0结束输入\n");
head_a=creat();
print(head_a);
printf("请输入b链表学生的数据：0 0 0结束输入\n");
head_b=creat();
print(head_b);
head_c=link(head_a,head_b);
printf("打印经过排序之后的学生数据,a,b链数据的结合\n");
print(head_c);
return 0;
}

struct student * creat()
{
int n=0;
struct student * head,*p1,*p2;
p1=p2=(struct student *)malloc(sizeof(struct student ));
scanf("%d%f%f",&p1->num,&p1->score[0],&p1->score[1]);
head=NULL;
while(p1->num!=0)
{
n=n+1;
if(n==1) head=p1;
else p2->next=p1;
p2=p1;
p1=(struct student *)malloc(sizeof(struct student));
scanf("%d%f%f",&p1->num,&p1->score[0],&p1->score[1]);
}
p2->next=NULL;
return head;
}

void print(struct student * head)
{
struct student *p;
p=head;
while(p!=NULL)
{
printf("%-10d%-10.1f%-10.1f\n",p->num,p->score[0],p->score[1]);
p=p->next;
}
return ;

}

struct student * link(struct student * head_a,struct student * head_b)
{
int n,m;
m=n=0;
struct student * head,*p1,*p2,*p3,*q;//q是在冒泡排序是（共需N-1趟排序）每趟的最后一次指针p1的位置，开始时q为Null
p1=head_a;
p2=head_b;
head=head_a;

while(p1->next!=NULL)
{p1=p1->next;n++;}
p1->next=p2;
p1=head_a;
while(p1!=NULL)
{
p1=p1->next;
n++; //n是计算链表的节点数，以备后面的排序用
}
q=NULL;
p1=head_a;
p2=p1->next ;
while(m<n)
{
m++;
//以下是采用冒泡法进行排序
while(p2!=q)
{
if(p1->num>p2->num)
{
if(head==p1) head=p2;
else p3->next=p2;
p1->next=p2->next;p2->next=p1;
//以下是按照 p3 p1 p2排序
p3=p2;p2=p1->next;
}
else
{
p3=p1;p1=p1->next;p2=p2->next;
}
}
q=p1;p1=head;p2=p1->next;
}
return (head);
}

Answer 2

这个是我曾经编写的一个管理里面的一个模块 就是按链表的某个变量进行排序的 希望您能看明白
Ranking_inquires(struct student *head)
{
int B=A,i=0;
struct student *temp=head;
struct student *p=head;
struct student *q=head;
printf("\t\t 按总分 名次查询 \n ");
printf("姓名 总分 名次\n");
while(p->next!=NULL&&A>1)//根据成员的成绩对结构体 进行排序
{
p->sum=p->math+p->English+p->chinese+p->computer;
q=p->next;
p=p->next;
while(q->next!=NULL)
{
q=q->next;
if(p->sum<q->sum)
{
h.stu_id1=p->stu_id;
strcpy(h.name1,p->name);
h.English1=p->English;
h.computer1=p->computer;
h.math1=p->math;
h.sum1=p->sum;
h.chinese1=p->chinese;
p->stu_id=q->stu_id;
strcpy(p->name,q->name);
p->English=q->English;
p->computer=q->computer;
p->math=q->math;
p->sum=q->sum;
p->chinese=q->chinese;
q->stu_id=h.stu_id1;
strcpy(q->name,h.name1);
q->English=h.English1;
q->computer=h.computer1;
q->math=h.math1;
q->sum=h.sum1;
q->chinese=h.chinese1;
}
}
A--;
++i;
p->ranking=i;
}

这个是定义的全局变量
int A=0;
int cc;
struct student
{
int stu_id;
char name[20];
float English;
float computer;
float chinese;
float math;
float sum;
int ranking;
struct student *next;
};
struct stu
{
int stu_id1;
char name1[20];
float English1;
float computer1;
float chinese1;
float math1;
float sum1;
}h;

Answer 3

直接插入法。