纯虚函数的入门程序

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#include <iostream>using namespace std;class original {public:    original(int i = 0, int j = 0) {        x0 = i;        y0 = j;    }    virtual void set()=0;    virtual void draw()=0;private:    int x0, y0;};class son1: public original {public:    son1(int i = 0, int j = 0, int m = 0, int n=0):original(i,j){        x1 = m; y1 = n;    }    void set() {        cout << "son1::set( " << x1++ << " )called\n";    }    void draw() {        cout << "son1::draw( " << --y1 << " )called\n";    }protected:    int x1, y1;};class son2:public original {public:    son2(int i=0, int j=0, int p=0, int q=0):original(i,j) {        x2 = p;        y2 = q;    }    void set() {        cout << "son2::set( " << ++x2 << " )called.\n";    }    void draw()  {        cout << "son2::draw( " << y2--  << " )called.\n";    }protected:    int x2, y2;};void drawobj(original *p) {    p->draw();}void setobj(original *p) {    p->set();}int main() {    son1 *s1obj = new son1;    son2 *s2obj = new son2;    drawobj(s1obj);    drawobj(s2obj);    cout << "another one!" << endl;    setobj(s1obj);    setobj(s2obj);    cout << "\nRedraw the objects\n";    drawobj(s1obj);    drawobj(s2obj);    return 0;}

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