说明：  这是c++primer plus的习题参考答案，还有课后的编程联系，是快速入门的理想资料，最好先自己做然后对照答案，多练习会有很快的进步的，编程练习的答案很难找到的。
(c primer plus the reference answer the questions, there are after-school programming links Quick Start is the ideal, it is necessary to control themselves then answer practice will be more progress soon. Programming practice and the answer is difficult to find.)