c++ opengl arithmetic text game

//pick between 5 or 10 questions.
//example of showing text in opengl and accepting keyboard input
//
//please modify/use at your own risk
//to compile (download all three files into a folder then)
//g++ -framework OpenGL -framework GLUT -o out main.cpp core.cpp -Wno-deprecated-declarations
//
//to run
//./out

Happy Sketching!