Multiple Inhertance

#include<iostream>
using namespace std;
class person
{

    string name;
    int age;
    public:
        void set_value(string s,int a)
        {
            name = s;
            age  = a;
        }

        void print()
        {
            cout<<"Name = "<<name<<endl;
            cout<<"Age  = "<<age<<endl;
        }
};

class student
{

    int level;
    public:
        void set_val(int k)
        {
            level = k;
        }

        void prints ()
        {
            cout<<"Level = "<<level<<endl;
        }
};
class hstudent:public person, public student
{
    string research;
    public:
        hstudent(string s,int a,int k, string r):person(s,a),student(k)
        {
            research = r;
        }

        void print_s()
        {
            person::print();
            student::prints();
            cout<<research;
        }
};
int main()
{
    hstudent s1("Omar",20,2,"OOP");
    s1.print_s();
}