guys pls help me in adding border to console screen

We're going to need an example of what you mean here OP.

i'm doing my c++ project so i just need a border in output screen for making it attractive

That's going to be a bit tricky. By convention a console window is 80 characters across so that part is easy. But the height isn't standardized. You could set the console windows height, but you would have to let us know what platform you are working on.

dos box

http://www.cplusplus.com/forum/beginner/173237/

Ncurses is still my recommendation

Getting off of DOSBox would be mine. Seriously, just for my own curiosity, what arbitrary reason are you using to justify the need to run on a 20 year old platform? My guess is that making your product look pretty is meaningless. Your grade is going to get thrashed for requiring an emulator.