c程序（有两个磁盘文件A和B,各存放一行字母，要求把这两个文件中的信息合并（按字母顺序排列），输出到一个新文件C中等等。）-c program (there are two disk files A and B, each storage row of letters, requested the information in these two documents combined (in alphabetical order), output to a new file C, etc.).