I am curious to hear some of y'all's ideas on programming practice for C/C++. I enjoy programming math oriented things but I also want this to be more than just text based. I want it to be a simple application. This can be a long or short program. I'd prefer it to be on the longer/larger side though.
It's loads of fun. It gives you a complex math problem to solve and you have to write a program to solve it.
Also, you could begin looking into 2D graphics and build a physics engine or something. There are loads of things to do, just let your imagination run wild. Look at other programs and say "I want to do that." Then do it.