Understanding Basics of C++ Program

/* Plain Practice for Myself ~ aTTiC */
/* v1.0 */

#include <iostream> // Include 2 Headers
#include <string>

using namespace std; // This is optional; cout instead of std::cout

struct Students // Characteristics of Students (main battery for code)
{
	char Name [80];
	string Grade;
	short testScore [3], Average;
};

Students*worms1 = NULL; // Pointer for Students to be used in functions

void assignCharacteristics (void); // Functions
void changeSettings (void);
void displayGrade (void);
short MAX = NULL; // Variable to determine the amount of students (Global Variable)

int main (void)
{
	short amountStudents; // Variable to determine the amount of  students (Local Variable)

	cout << "Enter # of students: "; // Displays "Enter # of Students" and expects a numerical value
	cin >> amountStudents;
	cin.ignore ();

	cout << "Amount of students = " << amountStudents << endl << endl;

	MAX = amountStudents; // Local Variable will have the full scope w/ the name of MAX

	assignCharacteristics (); // All the functions doing their work
	changeSettings ();
	displayGrade ();

	return 0; // int main (void) returns o since int is an integer.
}

void assignCharacteristics (void)
{
	Students*worms = new Students [MAX]; // Dynamic Memory Allocation to determine the amount of Students is present
	worms1 = worms; // Applies the pointer mentioned all the way above to the Dynamic MA
	
	for (short x = 0; x < MAX; x++) // Loop starts
	{
		cout << "Student #" << x + 1 << "'s name is: "; // 1st Partion of the loop; Makes you input names for each student
		cin.getline (worms [x].Name, 80);
		cout << endl;
		cout << worms [x].Name << ";" << endl;
		
		for (short y = 0; y < 3; y++) // Sub loop; makes you input the test scores for x student
		{
			cout << "Test score #" << y + 1 << ": ";
			cin >> worms [x].testScore [y];
			cin.ignore ();

			if (worms [x].testScore [y] > 100) // Test scores are from 0 to 100. If it surpasses ethier, it will reset to closest
				worms [x].testScore [y] = 100;
			else if (worms [x].testScore [y] < 0)
				worms [x].testScore [y] = 0;
		}

		cout << endl;
	}
} // Ends this function-NEXT FUNCTION
void changeSettings (void)
{
	short Choice; 
	bool Continue = false;

	do // The menu. do...while loop is always shown at least once
	{
		bool loopContinue = true;

		cout << "*****MENU*****" << endl;
		cout << "1 - Change Names" << endl;
		cout << "2 - Change Grades" << endl;
		cout << "3 - Continue" << endl;
		cout << "Default - Continue" << endl;
		cout << "Choice: ";
		cin >> Choice;
		cin.ignore ();

		if (Choice < 1 || Choice > 3)
			Choice = 0;

		cout << endl;
		
		switch (Choice)
		{
		case 1: // If 1st option was selected
			{
				cout << "**'Change Names' selected**" << endl;
				cout << "Choose 1 Student to whom you would like to change names:" << endl;

				for (short x = 0; x < MAX; x++) // loop displays all students
					cout << x + 1 << " - " << worms1 [x].Name << endl;

				cout << "Choice: ";
				cin >> Choice;
				cin.ignore ();

				if (Choice < 1)
					break;
				else if (Choice > MAX)
					break;


				for (short x = 0; (x < MAX) && (loopContinue == true); x++) // Determines which student was picked and changes name
				{
					
					if (Choice == (x + 1))
					{
						cout << endl;
						cout << "'" << worms1 [x].Name << "' selected" << endl;
						cout << "Type new name for this student: ";
						cin.getline (worms1 [x].Name, 80);
						cout << "New Name for student #" << x + 1 << " is " << worms1 [x].Name << endl << endl;
						loopContinue = false;
					}
				}
			}
				break;
		case 2: // If 2nd option was chosen
			{
				cout << "**'Change Grades' selected**" << endl;
				cout << "Choose 1 student to whom you would like to change grades:" << endl;

				for (short x = 0; x < MAX; x++) // loop displays all students
					cout << x + 1 << " - " << worms1 [x].Name << endl;

				cout << "Choice: ";
				cin >> Choice;
				cin.ignore ();

				if (Choice < 1)
					break;
				else if (Choice > MAX)
					break;

				for (short x = 0; (x < MAX) && (loopContinue == true); x++) // determines which students was selected
				{
					if (Choice == (x + 1))
					{
						cout << endl;
						cout << "'" << worms1 [x].Name << "' selected and grades are below:" << endl << endl;

						for (short y = 0; y < 3; y++) // once determined, displays students test scores
							cout << y + 1 << " - " << "Test Score: " << worms1 [x].testScore [y] << endl;

						cout << "Choice: ";
						cin >> Choice;
						cin.ignore ();
						
						if (Choice < 1)
							break;
						else if (Choice > 3)
							break;

						cout << endl;
						cout << "Change score " << worms1 [x].testScore [Choice - 1] << " to: ";
						cin >> worms1 [x].testScore [Choice - 1];
						cin.ignore ();

						if (worms1 [x].testScore [Choice - 1] > 100)
							worms1 [x].testScore [Choice - 1] = 100;
						else if (worms1 [x].testScore [Choice - 1] < 0)
							worms1 [x].testScore [Choice - 1] = 0;

						cout << "Changed!" << endl << endl;

						loopContinue = false;
					}
				}
			}
			break;
		case 3: // If 3rd option was selected
			Continue = true;
			break;
		default: // If user inputted any other character
			Continue = true;
		}
	}
	while (!Continue);
} // Function ended
void displayGrade (void)
{
	cout << endl;
	cout << "**GRADE DETERMINATION**" << endl;
	cout << "----" << endl;

	for (short x = 0; x < MAX; x++) // displays students name, average, grade
	{
		cout << worms1 [x].Name << ";" << endl;

		short sum = 0;

		for (short y = 0; y < 3; y++)
		{
			cout << "Test Score #" << y + 1 << " - " << worms1 [x].testScore [y] << endl;
			sum += worms1 [x].testScore [y];
		}

		worms1 [x].Average = (sum / 3);

		if (worms1 [x].Average >= 98)
			worms1 [x].Grade = "A+";
		else if ((worms1 [x].Average >= 95) && (worms1 [x].Average < 98))
			worms1 [x].Grade = "A";
		else if ((worms1 [x].Average >= 90) && (worms1 [x].Average < 95))
			worms1 [x].Grade = "A-";
		else if ((worms1 [x].Average >= 87) && (worms1 [x].Average < 90))
			worms1 [x].Grade = "B+";
		else if ((worms1 [x].Average >= 82) && (worms1 [x].Average < 87))
			worms1 [x].Grade = "B";
		else if ((worms1 [x].Average >= 79) && (worms1 [x].Average < 82))
			worms1 [x].Grade = "B-";
		else if ((worms1 [x].Average >= 74) && (worms1 [x].Average < 79))
			worms1 [x].Grade = "C+";
		else if ((worms1 [x].Average >= 71) && (worms1 [x].Average < 74))
			worms1 [x].Grade = "C";
		else if ((worms1 [x].Average >= 66) && (worms1 [x].Average < 71))
			worms1 [x].Grade = "C-";
		else if ((worms1 [x].Average >= 63) && (worms1 [x].Average < 66))
			worms1 [x].Grade = "D+";
		else if ((worms1 [x].Average >= 55) && (worms1 [x].Average < 63))
			worms1 [x].Grade = "D";
		else
			worms1 [x].Grade = "F";

		cout << "Average = " << worms1 [x].Average << endl;
		cout << worms1 [x].Name << "'s Final Grade: " << worms1 [x].Grade << endl << endl;
	}
}