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说明：  作为初学者的典范,但是程序有很些许错误，还希望高手指点，特别是运行时，每次出的结果不一样，更希望高手指点！(this project is just so so ,it can be used to study by the first learner!certainly ,there are some misstakes, but i can not find it ,because my level is just so so ,i hope you can correcting me !thank you very much !if you correct my project ,pleased send email to [e-mail] ,thanks! i found my project ,there are so many results when i run ,i do not know why?)