#include <iostream>

using namespace std;

// global constants
const int MAX_STUDENTS=5, MAX_SUBJECTS=3;

// helper functions
void getInput(int array[MAX_STUDENTS][MAX_SUBJECTS]);
void processArray(int array[MAX_STUDENTS][MAX_SUBJECTS]);
void displayArray(const int array[MAX_STUDENTS][MAX_SUBJECTS]);
void displayOdd(const int array[MAX_STUDENTS][MAX_SUBJECTS]);


int main()
{
	// initialise our array
	int marks[MAX_STUDENTS][MAX_SUBJECTS]={0};

	// get the user to input the marks
	getInput(marks);

	// Lets see what we've got so far
	cout << "The Marks entered were: " << endl;
	displayArray(marks);

	// now lets process the array and see what we get
	processArray(marks);
	cout << "After processing the marks are:" << endl;
	displayArray(marks);

	// Now let's see the results for students with odd subscripts, but only for subjects with odd subscripts...
	cout << "Odd students odd subject results:" << endl;
	displayOdd(marks);

	return 0;
}


// Get the user to populate the array
void getInput(int array[MAX_STUDENTS][MAX_SUBJECTS])
{
	for(int student=0;student<MAX_STUDENTS;++student)
	{
		cout << "Enter the marks for student " << student << ": " << endl;
		for(int subject=0;subject<MAX_SUBJECTS;++subject)
		{
			int value;
			cout << "Subject " << subject << ": ";
			cin >> value;
			array[student][subject] = value;
		}
		cout << endl;
	}
	cout << endl;
}

// Multiply each mark by itself
void processArray(int array[MAX_STUDENTS][MAX_SUBJECTS])
{
	for(int student=0;student<MAX_STUDENTS;++student)
	{
		for(int subject=0; subject<MAX_SUBJECTS; ++subject)
		{
			array[student][subject] = (array[student][subject]) * (array[student][subject]);
		}
	}
}

// Display entire contents of array
void displayArray(const int array[MAX_STUDENTS][MAX_SUBJECTS])
{
	for(int student=0;student<MAX_STUDENTS;++student)
	{
		cout << "Marks for student " << student << " :" << endl;
		for(int subject=0; subject<MAX_SUBJECTS; ++subject)
		{
			cout << "Subject " << subject << " : " << array[student][subject] << endl;
		}
		cout << endl;
	}
	cout << endl;
}

// Only display results for odd students odd subjects
void displayOdd(const int array[MAX_STUDENTS][MAX_SUBJECTS])
{
	for(int student=0;student<MAX_STUDENTS;++student)
	{
		if(student%2)
		{
			cout << "Marks for student " << student << " :" << endl;
			for(int subject=0; subject<MAX_SUBJECTS; ++subject)
			{
				if(subject%2)
					cout << "Subject " << subject << " : " << array[student][subject] << endl;
			}
			cout << endl;
		}
	}

	cout << endl;
}