Description: In the window of a ball, the ball with the level of 45 degrees angle for linear motion, when faced with the border, the rebound came back, still with the level of 45-degree angle to continue to campaign.
File list (Check if you may need any files):
7_12
....\7_12.cpp
....\7_12.dsp
....\7_12.dsw
....\7_12.ncb
....\7_12.opt
....\7_12.plg
....\Debug
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