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-   -   Please explain some concepts about Pointer & Class & Array Pointer (http://www.go4expert.com/forums/explain-concepts-pointer-class-array-t20739/)

 chaienbungbu 23Jan2010 02:55

I read this code section from a tutorial, but I cannot understand it thoroughly. It is about Pointer & Class Pointer & Array Pointer.

This is it:
Code:

```// pointer to classes example #include <iostream> using namespace std; class CRectangle {         private:                 int width, height;         public:                 // prototype                 void set_values (int,int);                 // method                 int area (void) {                         return (width * height);                 } }; // definion void CRectangle :: set_values (int a, int b) {         width = a;         height = b; } void main () {         CRectangle a, *b, *c;         CRectangle * d = new CRectangle[2];         //         b = new CRectangle;         c = &a;         a.set_values(1,2);         b -> set_values(3,4);         d -> set_values(5,6);         d[1].set_values(7,8);         //         cout << "a area: " << a.area() << endl;         cout << "*b area: " << b -> area() << endl;         cout << "*c area: " << c -> area() << endl;         cout << "d[0] area: " << d[0].area() << endl;         cout << "d[1] area: " << d[1].area() << endl;         //         delete[] d;         delete b;        }```
I try to search google and understand some parts of this code. But when it contains many concepts (i.e. pointer, array, class) in the BOLD section, I cannot grasp the points. Many operators (*, ->, etc. ), and I failed to distinguish between them.

Please explain it for me, especially the section in BOLD.

BTW, I see the "new" operator is very different from java one, is it right?

Thanks for any help.

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