Question

请用一个单链表来保存学生数据，链表中的每个结点包含的数据信息有学生的学号和一门课的成绩。编写一个crea

然后我的程序是这样写的
#include<stdio.h>
#include<stdlib.h>
struct stud
{
int num;
float score;
struct stud *next;
};
int main()
{
struct stud *create();
void print(struct stud *head);
struct stud *head;
head=create();
print(head);
}
struct stud *create()
{

struct stud *head,*p1,*p2;
int n=0;
head = NULL;

p2 = p1 = (struct stud*)malloc(sizeof(struct stud));
printf("Please input student's num and score:\n");
scanf("%d %f",&p1->num ,&p1->score );

while(p1->num !=0)
{
n=n+1;
if(n==1)
head = p1;
else
p2->next = p1;
p2 = p1;
p1 = (struct stud*)malloc(sizeof(struct stud));
scanf("%d %f",&p1->num ,&p1->score );

}
p2->next =NULL;

return head;
}
void print(struct stud *head)
{
struct stud *p;
p=head;
printf("Output student's num and score:\n");
while(p!=NULL)
{
printf("%-5d%5.1f\n",p->num ,p->score );
p=p->next ;
}

}
但是需要输入两个0才能结束运行，请帮忙改下只需要输入一个0就可以结束的

Answer 1

#include<stdio.h>
#include<stdlib.h>
struct stud
{
int num;
float score;
struct stud *next;
};
int main()
{
struct stud *create();
void print(struct stud *head);
struct stud *head;
head=create();
print(head);
}
struct stud *create()
{

struct stud *head,*p1,*p2;
int n=0;
head = NULL;

p2 = p1 = (struct stud*)malloc(sizeof(struct stud));
printf("Please input student's num and score:\n");

scanf("%d",&p1->num ); //修改的地方
if( p1->num == 0 ){ p2->next=NULL;return head;}
scanf("%f",&p1->score);

while(p1->num !=0)
{

n=n+1;
if(n==1)
head = p1;
else
p2->next = p1;
p2 = p1;
p1 = (struct stud*)malloc(sizeof(struct stud));

scanf("%d",&p1->num ); //修改的地方
if( p1->num == 0 ){ p2->next=NULL;return head;}
scanf("%f",&p1->score);

}
p2->next =NULL;

return head;
}
void print(struct stud *head)
{
struct stud *p;
p=head;
printf("Output student's num and score:\n");
while(p!=NULL)
{
printf("%-5d%5.1f\n",p->num ,p->score );
p=p->next ;
}

}