C + + NetEase cloud Classroom Development Engineer-header file and class declaration

Class-Differentiated classifications have two classics, 1 contain pointers (complex), and 2 do not contain pointers (string).

1.complex

The class is divided into: the data member part (the size of the data member in memory, the data may be many copies) and the function part ( only one copy ).

2.string

Class: Contains only one pointer ( which is understood here as a pointer to a data member), and the size of each data member created actually contains only one pointer.

3.c++ Programs Code Basic form

. h (header files) Classes Declaration (statement)

. CPP ()

The. h () standard library, which introduces the standard library in the form of angle brackets.

4. defensive declarations (so that the order of included include is unaffected)

#ifndef _complex_

#define _complex_

#endif

5. Layout of header Files

#ifndef _complex_

#define _COMPLEX_ Defense Statement

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#include <cmath>

Class Ostream;

Class complex;

complex& _DOAPL (complex* ths, const complex& R); front-facing declaration

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Class complex{ Declaration

....

};

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Complex::function ... class definition

Declaration of the 6.class (declaration)

introduction of template<typename t> template

Class complex{ class head

Public

Complex (T r = 0, t i = 0): Re (r), Im (r) {}

complex& operator + = (const complex&);

T Real () const {return re;}

T imag () const {return im;}

Private

T Re, im;

Friend complex& _DOAPL (complex*, const complex&);

};

-------------------------------------------------------------------------

{

Complex<double> C1 (2.5,1.5);

complex<int> C2 (2,6);

}

C + + NetEase cloud Classroom Development Engineer-header file and class declaration