【c++程序】模拟抽象类

#include<iostream>using namespace std;class Human{public:Human(){cout<<"构造Human"<<endl;}virtual void smart(){}virtual void beautiful(){}virtual ~Human(){cout<<"析构Human"<<endl;}};class father:virtual public Human {public:father(){cout<<"构造father"<<endl;}    virtual void smart(){cout<<"父亲很聪明"<<endl;}virtual ~father(){cout<<"析构父亲"<<endl;}};class mother:virtual public Human{public:mother(){cout<<"构造mother"<<endl;}virtual void beautiful(){cout<<"mother is very beautiful!"<<endl;}virtual ~mother(){cout<<"析构mother"<<endl;}};class son:public father,public mother{public:son(){cout<<"构造son"<<endl;}virtual void smart(){cout<<"儿子也很聪明"<<endl;}virtual void beautiful(){cout<<"儿子也很帅"<<endl;}~son (){cout<<"析构儿子"<<endl;}};int main(){Human *p;int choice=0;while(1){bool quit=false;cout<<"0-退出1-父亲2-儿子3-母亲"<<endl;cin>>choice;switch(choice){case 0:quit=true;break;case 1:p=new father;p->beautiful();delete p;break;case 2:p=new son;p->beautiful();p->smart();delete p;break;case 3:p=new mother;p->beautiful();delete p;break;default:cout<<"请输入0-3"<<endl;break;}if(quit){break;}}cout<<"END!!";return 0;}