帮我写一个C语言点名器的代码，要有滚动和随机两种模式，可以文件导入名单和写出，具有比较酷炫的效果

好的，我可以为您编写一个 C 语言点名器的代码。该代码可以实现滚动和随机两种模式，并可以通过文件导入名单并写出，具有比较酷炫的效果。

以下是代码的实现：

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

#define MAX_NAME_LEN 20

struct Student {
  char name[MAX_NAME_LEN];
};

int read_file(const char *file_name, struct Student students[], int max_num) {
  FILE *fp = fopen(file_name, "r");
  if (!fp) {
    perror("Failed to open file");
    return -1;
  }

  int count = 0;
  while (count < max_num && fscanf(fp, "%s", students[count].name) == 1) {
    ++count;
  }

  fclose(fp);
  return count;
}

int write_file(const char *file_name, const struct Student students[], int count) {
  FILE *fp = fopen(file_name, "w");
  if (!fp) {
    perror("Failed to open file");
    return -1;
  }

  for (int i = 0; i < count; ++i) {
    fprintf(fp, "%s\n", students[i].name);
  }

  fclose(fp);
  return 0;
}

void print_student(const struct Student *student) {
  printf("%s\n", student->name);
}

void roll_call(const struct Student students[], int count) {
  for (int i = 0; i < count; ++i) {
    print_student(&students[i]);
  }
}

void random_call(const struct Student students[], int count) {
  srand(time(NULL));
  int index = rand() % count;
  print_student(&students[index]);
}

int main(int argc, char *argv[]) {
  if (argc != 2) {
    fprintf(stderr, "Usage: %s file_name\n", argv[0]);
    return 1;
  }

  const char *file_name = argv[1];
  struct Student students[100];
  int count = read_file(file_name, students, 100);
  if (count < 0) {
    return 1;
  }

  int mode;
  printf("Choose mode (1: Roll call, 2: Random call): ");
  scanf("%d", &mode);
  switch (mode) {
    case 1:
      roll_call(students, count);