/* C++ Classes and Objects - Example Program */

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>
class STUDENT
{
	private:
		int rollno;
		char name[40];
		float marks;
		char grade;
	public:
		void read()			// mutator
		{
			cout<<"\nEnter rollno: ";
			cin>>rollno;
			cout<<"Enter name: ";
			gets(name);
			cout<<"Enter marks: ";
			cin>>marks;
		}
		void display()		// accessor
		{
			calculategrade();
			cout<<"Roll no.: "<<rollno<<"\n";
			cout<<"Name: "<<name<<"\n";
			cout<<"Marks: "<<marks<<"\n";
			cout<<"Grade: "<<grade<<"\n";
		}
		int getrollno()		// accessor
		{
			return rollno;
		}
		float getmarks()	// accessor
		{
			return marks;
		}
		void calculategrade()	// mutator
		{
			if(marks>=80)
			{
				grade = 'A';
			}
			else if(marks>=60)
			{
				grade = 'B';
			}
			else if(marks>=40)
			{
				grade = 'C';
			}
			else
			{
				grade = 'F';
			}
		}
};
void main()
{
	clrscr();
	STUDENT tw[5];
	for(int i=0; i<5; i++)
	{
		cout<<"\nEnter details for Student "<<i+1<<": ";
		tw[i].read();
	}
	int choice, rno, pos=-1, highmarks=0;
	do
	{
		cout<<"\nMain Menu\n";
		cout<<"1.Specific Student\n";
		cout<<"2.Topper\n";
		cout<<"3.Exit\n";
		cout<<"Enter youce choice(1-3): ";
		cin>>choice;
		switch(choice)
		{
			case 1:
				cout<<"Enter roll no of student whose details you want to know/see: ";
				cin>>rno;
				for(i=0; i<5; i++)
				{
					if(tw[i].getrollno()==rno)
					{
						tw[i].display();
						break;
					}
				}
				if(i==5)
				{
					cout<<"Invalid rollno..!!";
				}
				break;
			case 2:
				for(i=0; i<5; i++)
				{
					if(tw[i].getmarks()>highmarks)
					{
						pos=i;
						highmarks=tw[i].getmarks();
					}
				}
				tw[pos].display();
				break;
			case 3:
				cout<<"Exiting..press a key..";
				getch();
				exit(1);
			default:
				cout<<"Wrong choice..!!";
				break;
		}
	}while(choice>=1 && choice<=3);
	getch();
}