帮用C语言我写一个点名的完整代码

以下是两个部分的C语言点名器代码示例：

**部分一：基本结构与导入/导出名单**

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

// 定义学生结构体
typedef struct {
    char name[50];
} Student;

// 读取文件到学生数组
void loadNames(char *filename, Student *students, int *numStudents) {
    FILE *file = fopen(filename, "r");
    if (file == NULL) {
        printf("Error opening file.\n");
        return;
    }
    *numStudents = fread(students, sizeof(Student), 1, file);
    fclose(file);
}

// 写入学生数组到文件
void saveNames(char *filename, Student *students, int numStudents) {
    FILE *file = fopen(filename, "w");
    if (file == NULL) {
        printf("Error creating file.\n");
        return;
    }
    fwrite(students, sizeof(Student), numStudents, file);
    fclose(file);
}

// 滚动点名
void rollCall(Student *students, int numStudents) {
    // ...
}

// 随机点名
void randomRollCall(Student *students, int numStudents) {
    srand(time(NULL));
    int index = rand() % numStudents;
    printf("Today's student is: %s\n", students[index].name);
}

**部分二：主函数实现**

int main() {
    const char* filename = "student_list.txt";
    Student students[100]; // 假设最多有100个学生
    int numStudents = 0;

    // 加载学生名单
    loadNames(filename, students, &numStudents);

    // 开始点名循环
    while (true) {
        printf("\nChoose a mode: 1. Scroll 2. Random\n");
        int choice;
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                rollCall(students, numStudents);
                break;
            case 2:
                randomRollCall(students, numStudents);
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }

        // 询问是否保存点名结果
        char saveChoice;
        printf("Save current pointings? (y/n): ");
        scanf(" %c", &saveChoice);
        if (saveChoice == 'y') {
            saveNames(filename, students, numStudents);
        }
    }

    return 0;
}