Student

#include<bits/stdc++.h>
using namespace std;


class Student
{
    string name,rollno,section;
    double percentageofmark;
public:
    Student()
    {
        name="";
        rollno="";
        section="";
        percentageofmark=0.0;
    }
    Student(string nam,string rol,string sec,double mark)
    {
        this->name=nam;
        this->rollno=rol;
        this->section=sec;
        this->percentageofmark=mark;
    }
    ~Student()
    {
        //cout<<"destructor"<<endl;
    }
    void input()
    {
        cout<<"Enter Name Roll Section and Mark"<<endl;
        string nam,rol,sec;
        double mark;
        cin>>nam>>rol>>sec;
        cin>>mark;
        name=nam;
        rollno=rol;
        section=sec;
        percentageofmark=mark;
    }
    void show()
    {
        cout<<"Name: "<<this->name<<endl;
        cout<<"Roll_No:"<<this->rollno<<endl;
        cout<<"Section: "<<this->section<<endl;

    }
    void gradecalculator()
    {
        cout<<"Grade ";
        int x=this->percentageofmark;
         if(x>=90)
        {
            cout<<"A+"<<endl;
        }
        else if(x>=85)
        {
            cout<<"A"<<endl;
        }
        else if(x>=80)
        {
            cout<<"B+"<<endl;
        }
        else if(x>=75)
        {
            cout<<"B"<<endl;
        }
        else if(x>=70)
        {
            cout<<"C+"<<endl;
        }
        else if(x>=65)
        {
            cout<<"C"<<endl;
        }
        else if(x>=60)
        {
            cout<<"D+"<<endl;
        }
        else if(x>=50)
        {
            cout<<"D"<<endl;
        }
        else
        {
            cout<<"Fail"<<endl;
        }
    }
};
int main()
{
    Student s1;
    s1.input();
    s1.show();
    s1.gradecalculator();
    cout<<"Second Object"<<endl;
    Student s2("shahriar","20-43565-1","b[28]",85);
    s2.show();
    s2.gradecalculator();
    return 0;
}