小小的链表问题

[QQWDYY]

#include"stdio.h"
#include"malloc.h"
#include"stdlib.h"
struct Student
{
	char ID[20];
	char name[50];
	float score;
	struct Student *next;
};
main()
{
	struct Student *linkhead,*linktail,*student;
	float avescore;
	int totalstudent;
	linkhead=linktail=NULL;
	while(1)
	{
	
	student=malloc(sizeof(struct Student));
		scanf("%s %s %f",student->ID,student->name,&student->score);
		if(student->score<0)
		{
			free(student);
			break;
		}
		student->next=NULL;
		if(linktail==NULL)
		{
			linkhead=linktail=student;
		}
		else
		{
			linktail->next=student;
			linktail=student;
		}
	}
	avescore=0.0;
	totalstudent=0;
	while(student!=NULL)
	{
		totalstudent++;
		avescore=avescore+student->score;
		student=student->next;
	}
	avescore=avescore/totalstudent;
	printf("平均分：%5.2f\n",avescore);
	while(linkhead!=NULL)
	{
		student=linkhead;
		linkhead=student->next;
		free(student);
	}
	return 0;
}

可以输入数据　但是一算结果就错误了

[aaajj]

这样应该就可以了

#include"stdio.h"
#include"malloc.h"
#include"stdlib.h"
struct Student
{
    char ID[20];
    char name[50];
    float score;
    struct Student *next;
};
main()
{
    struct Student *linkhead,*linktail,*student;
    float avescore;
    int totalstudent;
    linkhead=linktail=NULL;
    while(1)
    {
    
    student=malloc(sizeof(struct Student));
        scanf("%s %s %f",student->ID,student->name,&student->score);
student->next=NULL;//////////////////

        if(student->score<0)
        {
            free(student);
            break;
        }
                if(linktail==NULL)
        {
            linkhead=linktail=student;
        }
        else
        {
            linktail->next=student;
            linktail=student;
        }
    }
    avescore=0.0;
    totalstudent=0;
student = linkhead;//////////
    while(student!=NULL)
    {
        totalstudent++;
        avescore=avescore+student->score;
        student=student->next;
    }
    avescore=avescore/totalstudent;
    printf("平均分：%5.2f\n",avescore);
    while(linkhead!=NULL)
    {
        student=linkhead;
        linkhead=student->next;
        free(student);
    }
    return 0;
}

[kouwenlong]

[Quote=引用 1 楼 aaajj 的回复:]
这样应该就可以了
C/C++ code#include"stdio.h"
#include"malloc.h"
#include"stdlib.h"struct Student
{char ID[20];char name[50];float score;struct Student*next;
};
main()
{struct Student*linkhead,*linktail,*student;float avescore;int totalstudent;
linkhead=linktail=NULL;while(1)
{

student=malloc(sizeof(struct Student));
scanf("%s %s %f",student->ID,student->name,&student->score);
student->next=NULL;//////////////////if(student->score<0)
{
free(student);break;
}if(linktail==NULL)
{
linkhead=linktail=student;
}else
{
linktail->next=student;
linktail=student;
}
}
avescore=0.0;
totalstudent=0;
student= linkhead;//////////while(student!=NULL)
{
totalstudent++;
avescore=avescore+student->score;
student=student->next;
}
avescore=avescore/totalstudent;
printf("平均分：%5.2f\n",avescore);while(linkhead!=NULL)
{
student=linkhead;
linkhead=student->next;
free(student);
}return0;
}
[/Quote]
楼上的还少了一点。如果不改这点，估计会报错吧。
student=malloc(sizeof(struct Student));应该改为student=(struct student *)malloc(sizeof(struct Student));