斯坦福大学的Java课上的作业，难度不高，但所需程序都必须是Top down design。-Stanford University, the Java class of operations, the difficulty is not high, but the procedure must be Top down design.

Messing around with entropy and trajectory paths of the Hailstone Sequence.

HailStone形象表达Excel。。。。。。。。。。。。。。(HailStone is the image expression of Excel.)