用c++编写一个程序，实现以下功能:输入一系列学生数据，将学生信息写入二进制文件中

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

typedef struct {
    char name[20];
    int age;
    float score;
} Student;

int main() {
    FILE *fp;
    Student stu;
    int count = 0;

    if ((fp = fopen("students.dat", "wb")) == NULL) {
        printf("Cannot open file.\n");
        exit(1);
    }

    printf("Enter student information (name, age, score):\n");
    while (1) {
        scanf("%s %d %f", stu.name, &stu.age, &stu.score);
        if (stu.score < 0) {
            break;
        }
        fwrite(&stu, sizeof(Student), 1, fp);
        count++;
    }

    fclose(fp);
    printf("%d students have been written to file.\n", count);

    return 0;
}