How can I make a useful program in c++. Is this program good or bad.?..read!?

Your program is good! :D The best thing to do is just keep making random programs and soon you'll get better and better and think of greater ideas. Just takes allot of practice and soon you'll be able to develop things easily. You can try what I do I ask people from school or anyone really do you need a program to help you out with something and from there I get tasks to do and it feels good to have people use what you made