一个简单的c++类的定义和实例化

#include "iostream"
#include <string>
using namespace std;

class mycoach
{
private:
    string name;
    short age = 0;
public:
    void coachgreeting(string  _name, int _age)
    {
        name = _name;
        age = _age;
        cout << "大家好，我是" << name << "今年芳龄" << age << endl;
    }
protected:
};
void main()
{
    char r[10] = {0};
    cout << "好好学编程，包养陈培昌" << endl;
    cout << "请翻帅哥的牌子：";
    cout << "厉智 陈培昌 程劲";
    cin>>r;
    cout << "这位爷翻了" << r << "的牌子" << endl;
    mycoach ritz;
    ritz.coachgreeting("厉智", 31);
    system("pause");
}