用c++语言实现定义一个基类person类，数据成员包含age,name，从该类派生一个employee （雇主）类，新增数据成员number（职工号）；再从emplovee类派 生一个executive（执行官）类，新增数据成员level(头街） ，每个类中都定义相应的函数为其赋值，并定义函数显示相关的信息，如 (“Smith is 28 years old,is an employee ”) 或 ("Smith is 30 years old,is an executive,level is the 2”），编写一个main函数，每个类定义1-2 个对象，然后显示他们的相关信息；

以下是用C++语言实现上述要求的代码示例：

#include <iostream>
#include <string>

class Person {
protected:
    int age;
    std::string name;

public:
    Person(int age, const std::string& name)
        : age(age), name(name) {}

    void displayInfo() {
        std::cout << name << " is " << age << " years old." << std::endl;
    }
};

class Employee : public Person {
private:
    int number;

public:
    Employee(int age, const std::string& name, int number)
        : Person(age, name), number(number) {}

    void displayInfo() {
        std::cout << name << " is " << age << " years old, is an employee." << std::endl;
    }
};

class Executive : public Employee {
private:
    int level;

public:
    Executive(int age, const std::string& name, int number, int level)
        : Employee(age, name, number), level(level) {}

    void displayInfo() {
        std::cout << name << " is " << age << " years old, is an executive, level is " << level << "." << std::endl;
    }
};

int main() {
    Person person(28, "Smith");
    person.displayInfo();

    Employee employee(30, "John", 1234);
    employee.displayInfo();

    Executive executive(35, "Alice", 5678, 2);
    executive.displayInfo();

    return 0;
}

运行该程序，输出将为：

Smith is 28 years old.
John is 30 years old, is an employee.
Alice is 35 years old, is an executive, level is 2.

以上代码定义了一个基类Person，和其派生类Employee和Executive。每个类都有相应的数据成员和成员函数用于赋值和显示相关信息。在main函数中，创建了一个Person对象、一个Employee对象和一个Executive对象，并调用了它们的displayInfo函数来显示相关信息。