为什么这个代码姓名不能输入三个及以上个汉字？

Question

姓名不能输入过多字符，输入过多字符时程序会结束

```c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>

struct Student         //自定义结构体
{
    int      number;
    char     name[100];
    int      jidao;
    int      math;
    int      eng;
    int      com;
}stu[40];
int main()    //输入学生信息
{
    int n = 0;
    int i = 0;
    char  c;
    do
    {
        printf("\t\t\t学号：");
        scanf_s("\t\t\t%d", &stu[n + i].number);
        printf("\t\t\t姓名：");
        scanf_s("\t\t\t%s", &stu[n + i].name,sizeof(50));
        printf("\t\t\t计导分数：");
        scanf_s("\t\t\t%d", &stu[n + i].jidao);
        printf("\t\t\t高数分数：");
        scanf_s("\t\t\t%d", &stu[n + i].math);
        printf("\t\t\t外语（日语/英语）分数：");
        scanf_s("\t\t\t%d", &stu[n + i].eng);
        printf("\t\t\tC语言分数：");
        scanf_s("\t\t\t%d", &stu[n + i].com);
        i++;
        printf("\t\t\t继续录入成绩吗？\n");
        printf("\t\t\t请输入‘y’继续，或's'停止");
        scanf_s("\t\t\t%c", &c,10);
    } while (c == 'y');
    return (i + n);
}

```

Answer 1

printf("\t\t\t姓名：");
scanf_s("\t\t\t%s", stu[n + i].name, sizeof(stu[0].name));
//scanf_s("\t\t\t%s", &stu[n + i].name, sizeof(50));