6-4 学生成绩链表处理(20 分)

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本题要求实现两个功能,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。

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

 

 

下面给出我的代码,欢迎斧正

 

#include 
#include 
 
struct stud_node {
    int    num;
    char   name[20];
    int    score;
    struct stud_node *next;
};
 
struct stud_node *createlist()
{
    struct stud_node* head = (struct stud_node*)malloc(sizeof(struct stud_node));
    head->next = NULL;
	struct stud_node* p = head;
    int ty;scanf("%d",&ty);
    while(ty!=0)//尾插法创建链表
    {
        p->next = (struct stud_node*)malloc(sizeof(struct stud_node));
        p = p->next;
        scanf("%s %d",p->name,&p->score);
        p->num = ty;
        p->next = NULL;
        scanf("%d",&ty);
    }
 
    return head;
}
 
struct stud_node *deletelist( struct stud_node *head, int min_score )
{
    struct stud_node* p = head;
    while(p->next != NULL)
    {
    	int flag = 0;
    	if(p->next->scorenext;
            //printf("%d %d\n",temp->num,temp->score);
            p->next = temp->next;
            free(temp);
	    flag = 1;
        }
	p = p->next;
        if(flag)//如果有删除节点,则重新开始,便于删除干净
	    p = head;
    }
 
    return head->next;//最终打印的时候直接从返回的head开始,需要跳过头结点
}
 
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;
}

 

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