C语言链表创建问题..123

Question

#include"stdafx.h"
#include
#define LEN sizeof(student)
struct student{
int num;
float score;
student *next;
};
student * creat(){
int num;
float score;
student *head, *p,*q;

q=p=head = (student *)malloc(LEN);
head->num = NULL;
scanf_s("%d%f",&num,&score);
while (num != 0)//如果输入0的话就当成结束
{
    p = (student*)malloc(LEN);
    p->num = num;
    p->score = score;
    p->next = NULL;
    q->next = p;
    q = p;
    scanf_s("%d%f",&num,&score);
}
p->next = NULL;
return head;

}
void print(student * head){
student *p;
p = head;
for (; p->next != NULL;)
{
printf("%d %f", p->next->num, p->next->score);
p = p->next;
}

}
void main(){
student *head;
creat();
head = creat();
print(head);

}
//我输入
1 20
2 30
3 40
0 10
的话没有输出什么东西啊

Answer 1

主函数里为什么会有两个creat函数调用，我把你的代码测试了一下，去掉第一个creat 是可以运行成功的，也有输出信息。另外你的代码缺少标准库能编译通过吗？希望有所帮助。
#include
#include
#define LEN sizeof(student)

struct student{
int num;
float score;
student *next;
};

student * creat(){
int num;
float score;
student head, *p,*q;
q=p=head = (student *)malloc(LEN);
head->num = NULL;
scanf("%d%f",&num,&score);
while (num != 0)//如果输入0的话就当成结束
{
p = (student)malloc(LEN);
p->num = num;
p->score = score;
p->next = NULL;
q->next = p;
q = q->next;
scanf("%d%f",&num,&score);
}
p->next = NULL;
return head;

}
void print(student * head){
student *p;
p = head;
for (; p->next != NULL;)
{
printf("%d %f", p->next->num, p->next->score);
p = p->next;
}

}
int main(){
student *head;
head = creat();
print(head);

return 0;
}