/*WAP to enter marks of asgnignment ,mtterm,etterm and find the gde and write to a file.*/

#include<fstream.h>
#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>


class result

{
	private:
		char name[35];
		char roll[10];
		int mt,et,asgn;
		char gde[3];
		float total;
	public:
		result()
			{
			strcpy(name,'\0');
			strcpy(roll,'\0');
			mt=et=asgn=0;
			total=0.0;
			strcpy(gde,'\0');
			}
		result(char *n, char *r, int m,int e, int a)
			{
			strcpy(name,n);
			strcpy(roll,r);
			mt=m;
			et=e;
			asgn=a;
			total=(float)((m+e+a)*100)/125;
			if(total>=0 && total<=39)
				strcpy(gde,"F");
			if(total>=40 && total<=44)
				strcpy(gde,"D");
			if(total>=45 && total<=49)
				strcpy(gde,"C");
			if(total>=50 && total<=59)
				strcpy(gde,"C+");
			if(total>=60 && total<=69)
				strcpy(gde,"B");
			if(total>=70 && total<=79)
				strcpy(gde,"B+");
			if(total>=80 && total<=89)
				strcpy(gde,"A");
			if(total>=90 && total<=100)
				strcpy(gde,"A+");
			}
		void InputMarks()
			{
			cin.get();
			cout<<"\nEnter the Name : ";
			cin.getline(name,35);
			cout<<"Enter the Roll No : ";
			cin>>roll;
			cout<<"Enter the Mark of mt Term (<=30), et Term (<=70) and asgnignment (<=25) respectively :";
			cin>>mt>>et>>asgn;
			total=(float)((mt+et+asgn)*100)/125;
			if(total>=0 && total<=39)
				strcpy(gde,"F");
			if(total>=40 && total<=44)
				strcpy(gde,"D");
			if(total>=45 && total<=49)
				strcpy(gde,"C");
			if(total>=50 && total<=59)
				strcpy(gde,"C+");
			if(total>=60 && total<=69)
				strcpy(gde,"B");
			if(total>=70 && total<=79)
				strcpy(gde,"B+");
			if(total>=80 && total<=89)
				strcpy(gde,"A");
			if(total>=90 && total<=100)
				strcpy(gde,"A+");
			cout<<total<<"\t"<<gde<<et;
			}
		void showResult()
			{
			cout.precision(2);
			cout<<"\n\nName: "<<name<<"\tRoll No : "<<roll<<"\tPercentage : "<<total<<"\tGrade : "<<gde;
			cout<<"\n\t Written By: Sujit Kr Nayak\n\t Roll No: ELD09006";
			}
		void storeFile(result s)
			{
			fstream infile;
			infile.open("res.txt",ios::out|ios::ate);
			infile.write((char *)&s, sizeof(result));
			infile.flush();
			infile.close();
			}
		void readFile()
			{
			fstream outfile;
			result s;
			outfile.open("res.txt",ios::in);
			outfile.read((char *)&s, sizeof(result));
			
			while(!outfile.eof())
			{
				s.showResult();
				outfile.read((char *)&s, sizeof(result));
			}
		}
};
void main()
	{
	result std;int ch;
	start:
	clrscr();
	
	cout<<"\n\t1: Enter an Entry.";
	cout<<"\n\t2: View all Entry.";
	cout<<"\n\t3: Exit.";
	cout<<"\n\tChoose from 1 to 3 option.";
	cin>>ch;
	switch(ch)
		{
		case 1:
			std.InputMarks();
			std.storeFile(std);
			cout<<"\n\tEntry Successful...!!!";
			getch();
		break;
		case 2:
			std.readFile();
			getch();
			break;
		case 3:
			exit(0);
		default:
			cout<<"\nInvalid choice....!!!";
		}
	goto start;


}