哪位朋友告诉我C++里try,catch,throw的用法

我给你一个我以前的例子，希望你能看懂，如果有不明白的地方加qq84396495
#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;
t