static variables

今天花了一天的时间教自己了static variable

1. static variable 自动 initialize to NULL(0)
2. static variable can pointer to a constant or variable. When pointing to a variable, that variable must be static. Same rule applies to that variable.
3. when return a value to a static variable from a function or method, the return value should be assigned to a static variable in that function.
4. VC++ won't tell you your static variable contains rubbish, when it points to a non-static variable.

很简单的一个问题，弄了我一天。这个在eclipse 里面用java写都会有错误提示。