Practice ( C++)

#include<iostream>

using namespace std;

class sessional{
public:
    string name;
    int studentNum ;
    double credit ;

    sessional(){
        studentNum=0;
        credit=3;
    }

    sessional(string n)
    {
        name=n;
    }

    void increaseStudent(int inc)
    {
        studentNum+=inc;
    }
};

int main()
{

     sessional os312 ;
     cout<<os312.credit<<endl ;

     os312.credit=7;
     cout<<os312.credit<<"\n" ;

     os312.increaseStudent(21);
     cout<<os312.studentNum<<endl;

     os312.increaseStudent(-3);
     cout<<os312.studentNum<<endl;

//     sessional cse307=sessional("compiler") ;
//     cout<<cse307.name<<endl;
//
//     string Name;
//     cout<<"name:";
//     cin>>Name ;

//     cout<<"input name:"<<Name<<endl;
//     return 0;
}