将程序保存并加载到磁盘文件

Question

如何将程序数据加载并保存到文件中？我有14个函数要保存到文件中，以后可以再次加载它。到目前为止，这就是我所拥有的。

/*assume I have a bunch of codes here that has the following parameters
   2 header files
   2 c files
  14 functions including save_file and load_file
*/


void save_file(gradebook *info) {
  FILE *out;
  char filename[10];

  printf("Enter name of file: ");
  scanf("%s", filename);

  out = fopen(filename, "w");

  /*function that reads all the characters and user input*/

 fclose(out);
}

我已经谷歌搜索并在整个论坛中查看了好几天，而且我被卡住了。任何人都可以帮助我吗？