Program to find depth of the file in a directory and list all files those are having more number of parent directories.
Program to calculate the sum of two big numbers (the numbers can contain more than 1000 digits). Don't use any library classes or methods (BigInteger etc...).
Write a program to recursively download the web pages available in the given site URL.
Create a file system:
We just have one file on the hard disk. But we can create directories, sub-directories and files in that file only.