#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct Student
{
    char * id;
    struct Student* next;
}stu;

stu* creatNode(char *idStr)
{
    stu *newNode=(stu*)malloc(sizeof(stu));
    newNode->id=(char*)malloc(sizeof(idStr));
    strcpy(newNode->id,idStr);
    newNode->next=NULL;
    return newNode;
}

void printf1(stu* head)
{
    stu* current=head->next;
    while(current!=NULL)
    {
        printf("%s",current->id);
        current=current->next;
    }
}

// 主函数测试
int main() {
    stu* head=(stu*)malloc(sizeof(stu));
    head->next=NULL;
    stu* node1=creatNode("1");
    head->next=node1;
    stu* node2=creatNode("2");
    node1->next=node2;
    stu* node3=creatNode("3");
    node2->next=node3;
    printf1(head);
    free(head);
}