#include <iostream>
#include <iomanip>

const int MAXSIZE = 25; //max size of array of structure-Student

struct Student
{
	char name[21];
	unsigned int id;
	unsigned int test1;
	unsigned int test2;
	unsigned int test3;
	double average;
	char grade;
};//end of structure Student

void get_data(Student x[], int&); //to read array of structures of size n
void compute_record(Student& x); //to compute the required fields
void print_record(Student x); //to print a student record showing all fields
void print_headings(void); //to display headings/subheadings


using namespace std;

int main(void)
{

	Student class1470[MAXSIZE];
	int n;
	
	//Get data from user
	get_data(class1470,n);

	//calculate average and letter grade and put in array
	for (int i=0; i<n; ++i)
		compute_record(class1470[i]);
		
	//print the heading for the table
	print_headings();

	//print out the student records
	for (int j=0; j<n; ++j)
		print_record(class1470[j]);

	//skip a space at end of table
	cout << endl;

	return 0;


}//end of function main

void get_data(Student x[], int& n)
{
	cout << "Enter the number of students(25 or less): ";
	cin >> n;

	//get student data from user
	for(int i=0; i<n; ++i)
	{
		cout << endl << "Enter the name of student number " << i + 1 << ": ";
		cin.ignore();
		cin.getline(x[i].name,21);
		cout << endl << "Enter the id of student number " << i + 1 << ": ";
		cin >> x[i].id;
		cout << endl << "Enter test 1 score for student number " << i + 1 << ": ";
		cin >> x[i].test1;
		cout << endl << "Enter test 2 score for student number " << i + 1 << ": ";
		cin >> x[i].test2;
		cout << endl << "Enter test 3 score for student number " << i + 1 << ": ";
		cin >> x[i].test3;
		cout << endl << endl;

	}// end of for loop

	return;
}//end of function get_data

void compute_record(Student& x)
{
	int average_rounded;
	
	//calculate average
	x.average = (x.test1 + x.test2 + x.test3)/3.0;

	//round average for the switch 
	average_rounded = x.average/10;

	//give student grade based on average
	switch (average_rounded)
	{
		case 10: ;
		
		case 9: x.grade = 'A';
			break;
		
		case 8: x.grade = 'B';
			break;

		case 7: x.grade = 'C';
			break;

		case 6: x.grade = 'D';
			break;

		default: x.grade = 'F';

	}//end of switch

	return;

}//end of function compute_record

void print_headings(void)
{
	//display the heading of the table
	cout << left << setw(22) << "Name"; 
	cout << left << setw(8) << "ID";
	cout << left << setw(8) << "Test1";
	cout << left << setw(8) << "Test2";
	cout << left << setw(8) << "Test3";
	cout << left << setw(10) << "Average";
	cout << "Letter Grade" << endl;
	//Underline the table headings
	cout << left << setw(22) << "----";
	cout << left << setw(8) << "--";
	cout << left << setw(8) << "-----";
	cout << left << setw(8) << "-----";
	cout << left << setw(8) << "-----";
	cout << left << setw(10) << "-------";
	cout << "------------" << endl;

	return;

}//end of function print_headings

void print_record(Student x)
{
	//print the student data
	cout << left << setw(22) << x.name;
	cout << left << setw(8) << x.id;
	cout << left << setw(8) << x.test1;
	cout << left << setw(8) << x.test2;
	cout << left << setw(8) << x.test3;
	cout << left << setw(10) << x.average;
	cout << x.grade << endl;

}//end of function print_record