初学CPP虚函数(一)

#include<iostream>using namespace std;class TradesPerson{public:virtual void sayHi(){cout << "just say hi" << endl;}};class Thinker : public TradesPerson{public:virtual void sayHi(){cout << "hi, I am thinker" << endl;}};class Tailor:public TradesPerson{public:virtual void sayHi(){cout << "hi, I am tailor" << endl;}};/************************************************************************//*有了虚函数一个test函数就搞定了，只需传递的*p用不同子类生成，那么就可以得到想要的结果，而没有虚函数，有100个派生类，要写100个sayHi函数*//************************************************************************/void test(TradesPerson *p){p->sayHi();}int main(){int caseTest;TradesPerson *p;cin >> caseTest;while(caseTest){switch(caseTest){case 1:p = new TradesPerson();p->sayHi();break;case 2:p = new Thinker();p->sayHi();break;case 3:p = new Tailor();p->sayHi();break;}delete p;cin >> caseTest;}return 0;}