AIX 程序设计大赛---AIX正方形问题

Simulated logs for prefab home construction are formed from PVC pipe which is filled with hard cast foam. The pipes are precast with a simulated log design to include knots, cracks and wood grain, and the bottom of each log contains a one inch groove to hold a longitudinally extending rubber gasket. The logs are attached together by threaded rod fasteners which utilize doubleended nuts, and caps are used to close off the ends of the log. Plumbing, electrical conduits, and the like may be retained within the tubing, and T-bolts are used to attach the initial log to a concrete foundation. The PVC pipe can be either of a round or square cross sectional shape and, in addition to log shapes, the PVC tubing can also be formed into rectangularly-shaped blocks similar to bricks and concrete blocks now used in the construction trade.