new class 2a 5b 5d c 2b 2b

1/*
2 Keyword "this"
3You can use keyword "this" to refer to this instance inside a class definition.
4
5One of the main usage of keyword this is to resolve ambiguity between the names of 
6data member and function parameter. For example:
7*/
8class Circle {
9private:
10   double radius;                 // Member variable called "radius"
11   ......
12public:
13   void setRadius(double radius) { // Function's argument also called "radius"
14      this->radius = radius;
15         // "this.radius" refers to this instance's member variable
16         // "radius" resolved to the function's argument.
17   }
18   ......
19}