问学生管理系统平台（代码有瑕疵，未成品）其中scanf未执行？

#include <stdio.h>
#include <stdlib.h>
#define N 1000
#define LEN sizeof(struct Student)
struct Student {
	int num[20];//学号
	char name[20];//姓名
	int Class[20];//班级
	float score[5];//该生在五门课程中所获得的分值
	float average[N];//学生五门课程的平均成绩 
	int levels[5];//五门课程的等级
	struct Student *next; 
}stu_information[N];
struct Course {
	int num;//课程编号
	char name[20];//课程名称
	int item[1000];//完成相应试题所获取的分值，假设每门课程最多包括1000道试题
};
int n;
int main()
{
	void Welcome();
	void InputStudent();
	void PrintStudent();
	while (1) {
		Welcome();
		char num;//num为起初选择的数字
		num = getchar();
		switch (num) {
		case'1':InputStudent(); break;//输入班级，学号，姓名，以逗号分离隔开
		case'2':printf("the calculating have been ended.Press any key to continue..."); break;//计算已结束，按任意键继续
		case'3':PrintStudent();break;
		case'4': {
			PrintStudent();
			break;
		}
		case'5': { system("cls");
			printf("\n\n\n                     Please input class number:"); break;
		}
		case'6':printf("Please input class,number,name,seperated by 'Enter'"); break;
		case'0':printf("Thanks for using!\n"); break;
		default:printf("input error!");break;
		}
		if(num=='0'||'1'||'2'||'3'||'4'||'5'||'6')break;
	}
	return 0;
}
void Welcome()//进入欢迎使用界面
{
	printf("\n\n\n\n\n\n");
	printf("                              |******Student Grade Management System******|\n");//学生成绩管理系统
	printf("                              |-------------------------------------------|\n");
	printf("                              |   Please  input  your  choose( 0--6 ):    |\n");//请输入你的选择（0--6）
	printf("                              |-------------------------------------------|\n");
	printf("                              |    1----input student's grades            |\n");//录入学生的成绩
	printf("                              |    2----calculate the average value       |\n");//计算平均值
	printf("                              |    3----output original grades            |\n");//输出原始成绩
	printf("                              |    4----sort by average value             |\n");//按平均值排序
	printf("                              |    5----modify the student's grade        |\n");//更改学生成绩
	printf("                              |    6----add the student's grade           |\n");//添加学生成绩
	printf("                              |    0----exit the system                   |\n");//退出系统
	printf("                              |-------------------------------------------|\n");
}
void InputStudent()//录入学生信息
{
	struct Student *head,*p1,*p2;
	head=NULL;
	n=0;
	p1=p2=(struct Student *)malloc(LEN);
	printf("input class,number,name,seperated by ‘ ,’\n");
	scanf("%c,%c,%c",&p1->Class,&p1->num,p1->name);
	if(p1->Class!=0)
	{
	printf("Please input the points for each of the 5 scores:\n");//请分别输入5门课程分值
	printf("score1:");scanf("%f",&p1->score[0]);printf("\n");
	printf("score2:");scanf("%f",&p1->score[1]);printf("\n");
	printf("score3:");scanf("%f",&p1->score[2]);printf("\n");
	printf("score4:");scanf("%f",&p1->score[3]);printf("\n");
	printf("score5:");scanf("%f",&p1->score[4]);printf("\n");
	}
	while(p1->Class!=0)
	{
	n+=1;
	if(n==1)head=p1;
	else p2->next=p1;
	p2=p1;
	p1=(struct Student *)malloc(LEN);
	printf("input class,number,name,seperated by ‘ ,’\n");
	scanf("%c,%c,%c",&p1->Class,&p1->num,p1->name);
	if(p1->Class!=0)
	{
	printf("Please input the points for each of the 5 scores:\n");//请分别输入5门课程分值
	printf("score1:");scanf("%f",&p1->score[0]);printf("\n");
	printf("score2:");scanf("%f",&p1->score[1]);printf("\n");
	printf("score3:");scanf("%f",&p1->score[2]);printf("\n");
	printf("score4:");scanf("%f",&p1->score[3]);printf("\n");
	printf("score5:");scanf("%f",&p1->score[4]);printf("\n");
	}
	p2->next=NULL;
	printf("Information entered successfully!");//录入信息成功 

}
}
void PrintStudent()
{
	system("cls");
	printf("                                          Sorted information is:\n");//排序后的信息是
	printf("\t\t   class   number   name   score1   score2   score3   score4   score5   average\n\n\n\n");
	printf("                                Press any key to continue..."); 
}