fixed #34.

fixed #33.

fixed #32.

fixed #31.

fixed #30.增加了说明，这里参考了《C++ Primer 习题集》里的说法。

fixed #27.

fixed format

fixed #29

更新11.4格式问题。

fixed #28.

update 9.31.

fixed #27, update "char *" to "const char *".

Merge branch 'master' of github.com:smzztx/CppPrimer_5th_cn

fixed #26.

fixed #25.