#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct stud_node{
    int num;
    char name[20];
    int score;
    struct stud_node*next;
};
struct stud_node*Creat_Stu_Doc();
void Print_Stu_Doc(struct stud_node*head);
struct stud_node*Creat_Stu_Doc()
{
    struct stud_node*head,*p;
    int num,score;
    char name[20];
    int size = sizeof(struct stud_node);
    head = NULL;
    printf("input num,name and score:\n");
    scanf("%d%s%d",&num,name,&score);
    while(num!=0){
        p=(struct stud_node*)malloc(size);
        p->num=num;
        strcpy(p->name,name);
        p->score= score;
        
    }
    return head;
}
void Print_Stu_Doc(struct stud_node*head)
{
    struct stud_node*ptr;
    if(head == NULL){
        printf("\nNo Records\n");
        return ;
    }
    printf("\nthe students`records are:\n");
    printf("   num   name   score\n");
    for(ptr=head;ptr;ptr=ptr->next)
    printf("%8d%20s%6d\n",ptr->num,ptr->name,ptr->score);
   
}
int main(void)
{
    struct stud_node*head,*p;
    int choice,num,score;
    char name[20];
    int size = sizeof(struct stud_node);
   
    do{
        printf("1:create 2:print 0:exit\n");
        scanf("%d",&choice);
        switch(choice){
            case 1:
            head=Creat_Stu_Doc();
            break;
            case 2:
            Print_Stu_Doc(head);
            break;
            case 0:
            break;
        }
        
    }while(choice != 0);
        return 0;
}
运行貌似有问题 帮忙看下