文件格式输出函数——fprintf()的使用，运行后报错

Question

在运行后，程序会出错无法运行，请问大佬们怎么解决。

#include<stdio.h>
#include<stdlib.h>
#define N 3

struct student
{
    char *number;
    char *name;
    int chinese, math, english;
}stu[N];

int main(void)
{
    FILE *fp;
    int i = 0;

    if (fopen_s(&fp, "d:\\wenjian\\test5.txt","wt") != NULL)
    {
        printf("cannot open file test5!\n");
        exit(1);
    }

    for (i = 0; i < N; i++)
    {
        printf("please put in number:\n");
        scanf_s("%s", stu[i].number, 20);
        printf("please put in name:\n");
        scanf_s("%s", stu[i].name, 20);
        printf("please put in chinese:\n");
        scanf_s("%d", &stu[i].chinese);
        printf("please put in math:\n");
        scanf_s("%d", &stu[i].math);
        printf("please put in english:\n");
        scanf_s("%d", &stu[i].english);
        fprintf(fp, "%s %s %d %d %d\n",
            stu[i].number, stu[i].name, stu[i].chinese, stu[i].math, stu[i].english);
    }
    fclose(fp);
    getchar();
    return 0;
}

Answer 1

struct student
{
    char number[20];
    char name[20];
    int chinese, math, english;
}stu[N];

if (fopen_s(&fp, "d:\\wenjian\\test5.txt","wt") != NULL)
->
if (fopen_s(&fp, "d:\\wenjian\\test5.txt", "wt+") != NULL)