C++-类与对象总结

const函数声明

1. 修饰成员函数，不会改变成员变量：

• a function b const (c){}: in member function means, all member properties in the function cannot be modified.

2.修饰形参，输入参数在函数中不会被更改，提高程序的健壮性：

• a function b (const c){}: the parameter c cannot be modified in the function

3. 修饰返回值，返回值不能修改，尤其用在返回值是指针类型的时候：

• const a function b (c){}: the return value a cannot be modified in the function