//hw 26
//ic210 section 4002
//23 oct 2009
#include <iostream>
#include <fstream>

using namespace std;

int** createArray(int rows, int cols);
void readData(int** dataArray, ifstream& file_in, int rows, int cols);

void printOneGrade     (int **grades, int rows, int cols, int student, int assignment);
void printOneStudent   (int **grades, int rows, int cols, int student);
//print max grade for the student
void printMaxOneStudent(int **grades, int rows, int cols, int student);

void printOneAssignment(int **grades, int rows, int cols, int assignment);
//print max grade for the assignment
void printMaxOneAssignment(int **grades, int rows, int cols, int assignment);

int main()
{
	// Constants -- to keep simple we assume 10 students and 10 assignments
	const int ROWS = 10;
	const int COLS = 10;


	// Create 2D array and read grades in
	// grades[i][j] will be grades of i'th student on j'th assignment
	int **grades = createArray(ROWS, COLS);

	ifstream fin("grades.txt");
	if (!fin)
	{
		cout << "ERROR: could not open file grades.txt." << endl;
		exit(1);
	}


	readData(grades, fin, ROWS, COLS);

	char ch;
	do {
		// Ask user what they want to know about
		int student, assignment;
		cout << "Enter student number [0..9]: ";
		cin >> student;
		cout << "Enter assignment number [0..9]: ";
		cin >> assignment;

		// Print out different info about the student and assignment
		printOneGrade     (grades, ROWS, COLS, student, assignment);
		printOneStudent   (grades, ROWS, COLS, student);
		printOneAssignment(grades, ROWS, COLS, assignment);

		//print max for student or assignemnt
		printMaxOneStudent   (grades, ROWS, COLS, student);
		printMaxOneAssignment(grades, ROWS, COLS, assignment);


		// Should we continue?
		cout << "Continue? (y/n) ";
		cin  >> ch;
	} while (ch == 'y');

	return 0;
}



int** createArray(int rows, int cols)
{
	int** dataArray = new int*[rows];
	for (int i = 0; i < rows; i++)
	{
		dataArray[i] = new int[cols];
	}
	return dataArray;
}

void readData(int** dataArray, ifstream& file_in, int rows, int cols)
{
	for (int i = 0; i < rows; i++)
	{
		for (int j = 0; j < cols; j++)
		{
			file_in >> dataArray[i][j];
		}
	}
}


// Prints grade for the given student and assignment
// e.g. "Grade for student 1 on assignment 3 is 74";
void printOneGrade     (int **grades, int rows, int cols, int student, int assignment)
{
	cout << "Grade for student " << student << " on assignment " << assignment;
	cout << " is " << grades[student][assignment] << endl;  

}


// Prints all grades for the given student
// e.g. "Grades for student 1 are:
//       96 67    56    74    94    100   98    68    95    65"
void printOneStudent   (int **grades, int rows, int cols, int student)
{
	cout << "Grades for student " << student << " are " << endl;
	for (int i=0; i<cols; i++)
	{
		cout << grades[student][i] << " ";
	}
	cout << endl;
}

// Prints all grades for the given assignment
// e.g. "Grades for assignment 3 are:
//       72 74 59 69 67 54 71 89 95"
void printOneAssignment(int **grades, int rows, int cols, int assignment)
{    
	cout << "Grades for assignment " << assignment << " are " << endl;
	for (int i=0; i<rows; i++)
	{
		cout << grades[i][assignment] << " ";
	}
	cout << endl;
}

// Prints the maximum score obtained by 'student' on any assignment
// For instance, for the first set of sample output above, this prints
//   The max grade for student 0 is 83
//   It was obtained for homework 4
void printMaxOneStudent(int **grades, int rows, int cols, int student)
{
	//declare vars
	int maxGrade;
	int maxAssignment;

	//initialize max with the first grade for this student
	maxGrade = grades[student][0];
	maxAssignment = 0;

	//compare current max with each grade; 
	//change max if current grade higher than current max
	for (int i = 1; i < cols; i++)
	{
		if (maxGrade < grades[student][i])
		{
			maxGrade = grades[student][i];
			maxAssignment = i;
		}
	}

	//output result
	cout << "The max grade for student " << student << " is " << maxGrade << endl;
	cout << "It was obtained for homework " << maxAssignment << endl;
}



// Prints the maximum score obtained by any student on ‘assignment’
// For instance, for the first set of sample output above, this prints
//   The max grade for assignment 4 is 98
//   It was obtained by student 6
void printMaxOneAssignment(int **grades, int rows, int cols, int assignment)
{
	//declare variables
	int maxGrade;
	int maxStudent;

	//initialize with the first grade for this assignment
	maxGrade = grades[0][assignment];
	maxStudent = 0;

	//compare current max with each grade; 
	//change max if current grade higher than current max
	for (int i = 1; i < rows; i++)
	{
		if (maxGrade < grades[i][assignment])
		{
			maxGrade = grades[i][assignment];
			maxStudent = i;
		}
	}

	//output result
	cout << "The max grade for assignment " << assignment << " is " << maxGrade << endl;
	cout << "It was obtained by student " << maxStudent << endl;

}