21天学会C++，

代码说明：

Teach Yourself C++ in 21 Days, Second Edition Week 1 at a Glance: Day 1 Getting Started Day 2 The Parts of a C++ Program Day 3 Variables and Constants Day 4 Expressions and Statements Day 5 Functions Day 6 Basic Classes Day 7 More Program Flow Week 1 in Review Week 2 at a Glance: Day 8 Pointers Day 9 References Day 10 Advanced Functions Day 11 Arrays Day 12 Inheritance Day 13 Polymorphism Day 14 Special Classes and Functions Week 2 in Review Week 3 at a Glance: Day 15 Advanced Inheritance Day 16 Streams Day 17 The Preprocessor Day 18 Object-Oriented Analysis and Design Day 19 Templates Day 20 Exceptions and Error Handling Day 21 Whats Next Week 3 in Review + Appendixes