本题要求实现两个函数,一个将输入的学生成绩组织成单向链表;另一个将成绩低于某分数线的学生结点从链表中删除。
函数接口定义:
struct stud_node *createlist();
struct stud_node *deletelist( struct stud_node *head, int min_score );
函数createlist利用scanf从输入中获取学生的信息,将其组织成单向链表,并返回链表头指针。链表节点结构定义如下:
struct stud_node {
int num; /*学号*/
char name[20]; /*姓名*/
int score; /*成绩*/
struct stud_node *next; /*指向下个结点的指针*/
};
输入为若干个学生的信息(学号、姓名、成绩),当输入学号为0时结束。
函数deletelist从以head为头指针的链表中删除成绩低于min_score的学生,并返回结果链表的头指针。
裁判测试程序样例:
#include <stdio.h>
#include <stdlib.h>
struct stud_node {
int num;
char name[20];
int score;
struct stud_node *next;
};
struct stud_node *createlist();
struct stud_node *deletelist( struct stud_node *head, int min_score );
int main()
{
int min_score;
struct stud_node *p, *head = NULL;
head = createlist();
scanf("%d", &min_score);
head = deletelist(head, min_score);
for ( p = head; p != NULL; p = p->next )
printf("%d %s %d\n", p->num, p->name, p->score);
return 0;
}
/* 你的代码将被嵌在这里 */
输入样例:
1 zhang 78
2 wang 80
3 li 75
4 zhao 85
0
80
输出样例:
2 wang 80
4 zhao 85
代码:
struct stud_node *createlist()
{
struct stud_node *p=NULL,*head=NULL,*tail=NULL;
int num,score;
char name[20];
head=(struct stud_node*)malloc(sizeof(struct stud_node));
head->next=NULL;
tail=head;
scanf("%d",&num);
while(1)
{
p=(struct stud_node*)malloc(sizeof(struct stud_node));
if(num==0)break;
p->num=num;
p->next=NULL;
scanf("%s%d",p->name,&p->score);
tail->next=p;
tail=p;
scanf("%d",&num);
}
return head;
}
struct stud_node *deletelist( struct stud_node *head, int min_score )
{
struct stud_node *p=head;
int flag;
while(p->next!=NULL)
{
flag=0;
if(p->next->score<min_score)
{
p->next=p->next->next;
flag=1;
}
if(flag==0)p=p->next;
}
return head->next;
}