This is a mathematical exercises application for school students that shows laws and needed info about geometrical shapes then can generate exercises to test absorption
Bonus:
there is an extra choice in the main menu, the choice named "Use File". If the user chooses this option, then program reads five entries from a text file named "input.txt". One entry for each shape (Rectangle, Circle, Triangle, Cube, and Cylinder). Then the program calculates the areas of the five shapes and sort them in an ascending order and write these values to a file named "output.txt".