try catch

#include<iostream>#include <string>using namespace std;class Person{private: int age; string name;public: void setAge(int); void setName(string);};class Error{public: virtual void show()=0;};class nameError:public Error{public: void show() { cout<<"name is error"<<endl; } };class ageError:public Error{public: void show() { cout<<"age is error"<<endl; }};void Person::setAge(int a){ ageError ag; if(a<0||a>100) throw ag; this->age=a;}void Person::setName(string str){ nameError ne; if(str=="exit") throw ne; this->name=str;}int main(void){ Person p; try { p.setAge(0); p.setName("exit"); } catch(Error &er) { er.show(); } cout<<"hello world"<<endl; return 0;}