运行结果不正确，是不是链表有问题?

#include
#include
#include
#include
int n=0;//歌手的结构体
typedef struct singer
{

int num;//编号
char name[20];//姓名

int score[10];//十个评委的评分

int sum;//总分

float average;//平均分

struct singer *next; //结构体的内部指针

}Singer;

void Menu();

Singer *create();
void grade(Singer *head);
void print(Singer *head);

int main()
{
Singer *head=NULL;

int choice;
while (1)
{
system("cls");
Menu();
scanf("%d", &choice);
switch (choice)
{

case 1:

//输入选手数据

head=create();
break;
//评委打分

case 2:

grade(head);

break;

//查看所有数据

case 4:

print(head);
break;

}
}
return 0;
}

void Menu()
{
printf("\t\t\t ————————\n");

printf("\t\t\t | 歌手比赛系统 | \n");
printf("\t\t\t ————————\n");
printf("\t\t\t1.输入选手数据\n");
printf("\t\t\t2.评委打分\n");
printf("\t\t\t3.成绩排序\n");
printf("\t\t\t4.数据查询\n");
printf("\t\t\t5.追加选手数据\n");
printf("\t\t\t6.写入数据文件\n");
printf("\t\t\t7.退出系统\n");
printf("\t\t\t请选择:");
}

Singer create()
{
system("cls");

Singer *q,*p,*head;
head=NULL;
q=p=(Singer)malloc(sizeof(Singer));
while(1)
{
n++;

if(n==1)

head=p;

else q->next=p;

q=p;
p=(Singer*)malloc(sizeof(Singer));
printf("请输入选手的编号:(输0结束)");
scanf("%d",&p->num);
if(p->num==0)

break;
printf("请输入选手的姓名：");
scanf("%s",&p->name);
}
q->next =NULL;
printf("输入结束!");
return head;
}

//显示全部数据
void print ( Singer *head)
{

Singer *p=head;

if(p!=NULL)

{
printf("编号 姓名 总分 平均分");
while(p!=NULL)

{

printf("%d %s %d %d",p->num,p->name,p->sum,p->average);

p=p->next;
}
}

else

printf("没有选手信息");
}

void grade(Singer *head)
{

system("cls");

Singer *p;

p=head;
if(p!=NULL)

{

while(p!=NULL)

{

int i,number;
printf("请输入要打分的选手的编号:");
scanf("%d",&number);
if(p->num==number)
{
for(i=0;i { printf("请输入第%d位评委的评分",i+1);
scanf("%d",&p->score[i]);
}

}
else
printf("没有该选手!");
}
}
}

大佬们，帮帮忙，改了半天还是一样的

链表没有错，感觉grade函数有错误，改成下面这样试试：

void grade(Singer *head)
{

    system("cls");

    Singer *p;

    p=head;
    if(p!=NULL)

    {
        bool flag = false;
        int i,number;
        printf("请输入要打分的选手的编号:");
        scanf("%d",&number);

        while(p!=NULL)  
        {
            if(p->num==number)
            {
                flag = true;
                for(i=0;i<10;i++) 
                { 
                    printf("请输入第%d位评委的评分",i+1);
                    scanf("%d",&p->score[i]);
                }

            }
            else
                p=p->next;
        }

        if (!flag)
        {
            printf("没有选手信息");
        }
    }
}