The following text was written to the standard output stream when the ? program was executed from IntelliJ.
square = Square: side=400.0 area of square = 160000.0 perimeter of square = 1600.0 diagonal of square = 565.685424949238 disk = Circle: radius=200.0 disk area = 125663.70614359173 perimeter of disk = 1256.6370614359173 diamond = Square: side=282.842712474619 diamond area = 80000.0