why default directories(. & ..)

[Manmeet Kaur]

1. Why are default directories . and .. included in DOS?
2. If three files with same name(ab) but extensions as .com, .bat and .exe are present in the same directory, then if we write at the prompt
                                          c:\>ab
then which file will execute first?
3. How can a same c++ compiler run the c++ programs as well as c?

[yeah right]

1.  "." is current directory and ".." is the parent of the current directory

2.  Not 100% sure but i believe that the .exe file has the highest priority

3.  MS visual c++ runs both.   Infact a lot of c++ compilers can compile c code.