C程序设计经典300例2of3.docx

1.*****************************************//类的多态实现#include iostreamusing namespace std;class salary{public:salary(){}~salary(){}virtual void pay(){}private:};class member1:public salary{public:member1(double a){_total=a;}~member1(){}void pay(){cout每月给员工1的薪水为：_total元endl;}private:double _total;};class member2:public salary{public:member2(double a){_total=a;}~member2(){}void pay(){cout每月给员工2的薪水为：_total元endl;}private:double _total;};void main(){member1 m1(4000.0);member2 m2(10000.0);salary *sa1=m1;salary *sa2=m2;sa1-pay();sa2-pay();}2*********************************************//实例113 动物对象进化（继承）#include iostreamusing namespace std;class animal_ancestor{public:animal_ancestor(){}~animal_ancestor(){}void respire()//呼吸{cout可以呼吸endl;}};class ape:public animal_ancestor{public:ape(){}~ape(){}void move()//行走{cout可以行走endl;}};class human:public ape{public:human(){}~human(){}void miss(){cout可以想念某人endl;}};void main(){human _human;cout人类;_human.respire();_human.move();_human.miss();}3.************************************************//实例112 求圆的面积和周长#include iostreamusing namespace std;#define Pi 3lass circle{public:double area(double x){return Pi*x*x;}double circumfer(double y){return 2*Pi*y;}public:double radius;};void main(){circle _circle;cout请输入圆的半径：;cin_circle.radius;cout圆的面积为：_circle.area(_circle.radius)endl;cout圆的周长为：_circle.circumfer(_circle.radius)endl;}4-**********************************************/实例111 乡村生产总值（同类对象数据统计（ABC对象相加））#include iostreamusing namespace std;class Cun_product{public:Cun_product(){veget_result=0;fruit_result=0;grain_result=0;}Cun_product(double x,double y,double z){veget_result=x;fruit_result=y;grain_result=z;}~Cun_product(){}friend Cun_product operator+(Cun_product cun1,Cun_product cun2);//重载友元运算符函数void output(){coutveget_result,fruit_result,grain_resultendl;}private:double veget_result;double fruit_result;double grain_result;};Cun_product operator+(Cun_product cun1,Cun_product cun2){Cun_product add;add.veget_result=cun1.veget_resu