C语言向二进制文件尾添加结构体

struct student { //学生结构体
char name[LENGTH];
char num[LENGTH];
int chinese;
int math;
int english;
}stu;

void inputScore() //(B)录入学生成绩//
{
FILE *file;
file=fopen("E:\\stu_score.dat","ab");
if(file==FAIL){
printf("File Is Not Exist.\n");
file=fopen("E:\\stu_score.dat","wb+");
printf("File Is Set Up.\n");
file=fopen("E:\\stu_score.dat","ab");
}
printf("Intput name:");
gets(stu.name);
printf("Intput num:");
gets(stu.num);
printf("Intput chinese:");
scanf("%d",&stu.chinese);
printf("Intput math:");
scanf("%d",&stu.math);
printf("Intput english:");
scanf("%d",&stu.english);

fwrite(&stu,sizeof(student),1,file);

fclose(file);
}子函数如图 但是不知道为什么储存不了 求解!!

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