public static void MainLoop(Student[] student, int itemcount)
{
ShowMenu();
int yourchoice;
string confirm = "y";
do
{
Console.Write("Enter your choice(1-9): ");
yourchoice = int.Parse(Console.ReadLine());
switch (yourchoice)
{
case 1: Add(student, ref itemcount); break;
case 2: Delete(student, ref itemcount); break;
case 3: Update(student, itemcount); break;
case 4: ViewAll(student, itemcount); break;
case 5: Average(student, itemcount); break;
case 6: ShowMax(student, itemcount); break;
case 7: ShowMin(student, itemcount); break;
case 8: ShowRecord(student, itemcount); break;
case 9: BubbleSort(student, itemcount); break;
default: Console.WriteLine("Invalid Choice."); break;
}
Console.Write("Press y or Y to continue:");
confirm = Console.ReadLine().ToString();
} while (confirm == "y" || confirm == "Y");
}
public static void Add(Student[] student, ref int itemcount)
{
int loop = 0;
while (loop == 0)
{
Console.WriteLine();
Console.Write("Enter student's ID:");
student[itemcount].Number = Console.ReadLine().ToString();
//making sure the record to be added doesn't already exist
if (Search(student, student[itemcount].Number, itemcount) != -1)
{
Console.WriteLine("This ID already exists.");
}
else
{
loop = 1;
}
}
Console.Write("Enter student's Name: ");
student[itemcount].Name = Console.ReadLine().ToString();
Console.Write("Enter student's Sex(F or M): ");
student[itemcount].Sex = Console.ReadLine().ToString();
Console.Write("Enter student's Quiz1 score: ");
student[itemcount].Quiz1 = float.Parse(Console.ReadLine());
Console.Write("Enter student's Quiz2 score: ");
student[itemcount].Quiz2 = float.Parse(Console.ReadLine());
Console.Write("Enter student's Assigment score: ");
student[itemcount].Assigment = float.Parse(Console.ReadLine());
Console.Write("Enter student's Midterm score: ");
student[itemcount].Midterm = float.Parse(Console.ReadLine());
Console.Write("Enter student's Final score: ");
student[itemcount].Final = float.Parse(Console.ReadLine());
student[itemcount].Total = student[itemcount].Quiz1 + student[itemcount].Quiz2 + student[itemcount].Assigment + student[itemcount].Midterm + student[itemcount].Final;
++itemcount;
}
public static void ShowRecord(Student[] student, int itemcount)
{
string id;
Console.Write("Enter student's ID to show scores: ");
id = Console.ReadLine();
int index = Search(student, id.ToString(), itemcount);
if (index != -1)
{
Console.Write("{0,-5}{1,-20}{2,-5}", student[index].Number, student[index].Name, student[index].Sex);
Console.Write("{0,-5}{1,-5}{2,-5}", student[index].Quiz1, student[index].Quiz2, student[index].Assigment);
Console.Write("{0,-5}{1,-5}{2,-5}", student[index].Midterm, student[index].Final, student[index].Total);
Console.WriteLine();
}
else Console.WriteLine("That record doesn't exist.");
}
public static void BubbleSort(Student[] dataset, int n)
{
int i, j;
for (i = 0; i < n; i++)
for (j = n - 1; j > i; j--)
if (dataset[j].Total < dataset[j - 1].Total)
{
Student temp = dataset[j];
dataset[j] = dataset[j - 1];
dataset[j - 1] = temp;
}
}
public static void Average(Student[] student, int itemcount)
{
string id;
float avg = 0;
Console.Write("Enter student's ID to find their Average Score: ");
id = Console.ReadLine();
int index = Search(student, id.ToString(), itemcount);
if (index != -1 && itemcount > 0)
{
avg = student[index].Total / 5;
}
Console.WriteLine("This student's Average Score is {0}.", avg);
}
public static void ShowMin(Student[] student, int itemcount)
{
float min = student[0].Total;
int index = 0;
if (itemcount != 0)
{
for (int j = 0; j < itemcount - 1; ++j)
if (min > student[j + 1].Total)
{
min = student[j + 1].Total;
index = j + 1;
}
}
else
{
Console.WriteLine("No records found!");
index = -1;
}
if (index != -1)
{
Console.WriteLine("The student with ID:{0} has the lowest score: {1}.", student[index].Number, min);
}
}
public static void Update(Student[] student, int itemcount)
{
string id;
int ColumnIndex;
Console.Write("Enter student's ID to be updated: ");
id = Console.ReadLine();
Console.Write("Which field you want to update(1-7)?:");
ColumnIndex = int.Parse(Console.ReadLine());
int index = Search(student, id.ToString(), itemcount);
if ((index != -1) && (itemcount != 0))
{
if (ColumnIndex == 1)
{
Console.Write("Enter student's Name: ");
student[index].Name = Console.ReadLine().ToString();
}
else if (ColumnIndex == 2)
{
Console.Write("Enter student's Sex(F or M):");
student[index].Sex = Console.ReadLine().ToString();
}
else if (ColumnIndex == 3)
{
Console.Write("Enter student's quizz1 score:");
student[index].Quiz1 = float.Parse(Console.ReadLine());
}
else if (ColumnIndex == 4)
{
Console.Write("Enter student's quizz2 score:");
student[index].Quiz2 = float.Parse(Console.ReadLine());
}
else if (ColumnIndex == 5)
{
Console.Write("Enter student's assigment score:");
student[index].Assigment = float.Parse(Console.ReadLine());
}
else if (ColumnIndex == 6)
{
Console.Write("Enter student's mid term score:");
student[index].Midterm = float.Parse(Console.ReadLine());
}
else if (ColumnIndex == 7)
{
Console.Write("Enter student's final score:");
student[index].Final = float.Parse(Console.ReadLine());
}
else Console.WriteLine("Invalid column index");
student[index].Total = student[index].Quiz1 + student[index].Quiz2 + student[index].Assigment + student[index].Midterm + student[index].Final;
}
else Console.WriteLine("The record doesn't exist. Check the ID and try again.");
}
public static void Remove(Student[] student, int index)
{
student[index].Number = null;
student[index].Name = null;
student[index].Sex = null;
student[index].Quiz1 = 0;
student[index].Quiz2 = 0;
student[index].Assigment = 0;
student[index].Midterm = 0;
student[index].Final = 0;
student[index].Total = 0;
}
public static void Delete(Student[] student, ref int itemcount)
{
string id;
int index;
if (itemcount > 0)
{
Console.Write("Enter student's ID to be deleted:");
id = Console.ReadLine();
index = Search(student, id.ToString(), itemcount);
if ((index != -1) && (itemcount != 0))
{
if (index == (itemcount - 1))
{
Remove(student, index);
--itemcount;
Console.WriteLine("The record was deleted.");
}
else
{
for (int i = index; i < itemcount - 1; i++)
{
student[i] = student[i + 1];
Remove(student, itemcount);
--itemcount;
}
}
}
else
{
Console.WriteLine("The record doesn't exist. Check the ID and try again.");
}
}
else
{
Console.WriteLine("There are no records to delete.");
}
}
public static int Search(Student[] student, string id, int itemcount)
{
int found = -1;
for (int i = 0; i < itemcount && found == -1; i++)
{
if (student[i].Number == id)
{
found = i;
}
}
return found;
}
public static void ViewAll(Student[] student, int itemcount)
{
int i = 0;
Console.WriteLine("{0,-5}{1,-20}{2,-5}{3,-5}{4,-5}{5,-5}{6,-5}{7,-5}{8}(column index)", "0", "1", "2", "3", "4", "5", "6", "7", "8");
Console.WriteLine("{0,-5}{1,-20}{2,-5}{3,-5}{4,-5}{5,-5}{6,-5}{7,-5}{8,-5}", "ID", "NAME", "SEX", "Q1", "Q2", "As", "Mi", "Fi", "TOTAL");
Console.WriteLine("*********************************");
while (i < itemcount)
{
if (student[i].Number != null)
{
Console.Write("{0,-5}{1,-20}{2,-5}", student[i].Number, student[i].Name, student[i].Sex);
Console.Write("{0,-5}{1,-5}{2,-5}", student[i].Quiz1, student[i].Quiz2, student[i].Assigment);
Console.Write("{0,-5}{1,-5}{2,-5}", student[i].Midterm, student[i].Final, student[i].Total);
Console.Write("\n");
}
i += 1;
}
}