1、编写一个创建子目录的程序，具体要求如下：

1)用键盘输入一个目录路径名，若输入的字符串为空，则程序运行结束；

2)若目录创建成功，显示成功信息，否则，显示创建失败信息。

2、编写一个创建文件的程序，其要求如下：

1)用键盘输入文件名(可包含路径)，若输入的字符串为空，则程序运行

结束；

2)若目录创建成功，显示成功信息，否则，显示创建失败信息；

3)从键盘输入20 个字符存放到新建立的文件中。

3、利用文件句柄将两个文件合并成一个文件。要求： 1）在第一个文件末

尾处换行回车，插入“The second file as follow:” 2）换行回车，把第二个文件

内容存放在后面。-1, write a program to create subdirectories, the specific requirements are as follows: 1) use the keyboard to enter a directory path name, if the input string to the end of the blank, the program runs　2) If the directory is successfully created, a success message is displayed, otherwise, Create a failure message is displayed. 2, write a program to create the file, its requirements are as follows: 1) Enter the file name (including the path), if the input string is empty, the program run ends　2) If the directory is successfully created, a success message is displayed, Otherwise, create a display failure information　3) input from the keyboard 20 characters stored in the newly created file. 3, the use of file handles will merge the two files into one file. Requirements: 1) In the first carriage return line feed at the end of the file, insert " The second file as follow:"　 2) carriage return line feed, the second file contents stored in the back.