Learning notes-put the class declaration in the *. h header file, and put the class definition in *. cpp. Main # include "*. H ".

// Shape. h. In the header file folder # include <iostream> using namespace STD; # define PI 3.1415926 class shape {public: Virtual void print () = 0; virtual float area () = 0 ;}; class circle: Public shape {float R; public: Circle (float R); void print (); float area () ;}; class rectangle: public shape {float length, width; public: rectangle (float length, float width); void print (); float area ();};

 

 

// Shape. place CPP in the source file folder # include "shape. H "circle: Circle (float R) {This-> r = r;} void circle: Print () {cout <"the r of this circle is" <r <Endl;} float circle: Area () {return (float) pI * r ;} rectangle: rectangle (float length, float width) {This-> length = length; this-> width = width;} void rectangle: Print () {cout <"the length is" <length <Endl <"the width is" <width <Endl;} float rectangle: Area () {return length * width ;}

 

 

// Put main into the source file folder # include "shape. H "int main () {shape * s; S = new circle (442); s-> Print (); cout <"The area of the circle is" <s-> area () <Endl; Delete s; S = new rectangle (10, 5 ); s-> Print (); cout <"The area of the rectangle is" <s-> area () <Endl; Delete s; S = NULL; int N; cin> N; return 0 ;}

Author: Lin yufei
Source: http://www.cnblogs.com/zhengyuhong/
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