I have searched a lot and after following all these links...
How to install ant contrib under windows
all I could generate is just only cpptasks.jar and nothing else.
Can anyone please guide me towards ant-contrib-0.3.jar?
On ant-contrib.sourceforge.net you can find a "downloads" link (somewhere in the middle of the text). This will lead you to the files section where you can find the archives for version 0.3: http://sourceforge.net/projects/ant-contrib/files/ant-contrib/ant-contrib-0.3/