//Source code
using System;
class Subject
{
public string SubjectName;
public Subject Next;
}
class ListOfSubjects
{
private int size;
public ListOfSubjects()
{
size = 0;
Head = null;
}
public int Count
{
get { return size; }
}
public Subject Head;
public int Add(Subject NewItem)
{
Subject Sample = new Subject();
Sample = NewItem;
Sample.Next = Head;
Head = Sample;
return size++;
}
public Subject Retrieve(int Position)
{
Subject Current = Head;
for (int i = 0; i < Position && Current != null; i++)
Current = Current.Next;
return Current;
}
public bool Delete()
{
if (Head == null)
{
Console.WriteLine("The list is empty");
return false;
}
Subject Current;
Current = Head.Next;
Head.Next = Current.Next;
size--;
return true;
}
public bool Delete(int Position)
{
if (this.Retrieve(Position) == null)
return false;
this.Retrieve(Position - 1).Next = this.Retrieve(Position + 1);
size--;
return true;
}
public bool Find(Subject ItemToFind)
{
Subject Current = new Subject();
if (ItemToFind == null)
return false;
for (Current = Head; Current != null; Current = Current.Next)
{
if (Current.SubjectName == ItemToFind.SubjectName)
return true;
}
return false;
}
}
class Exercise
{
static int Main()
{
ListOfSubjects Subjects = new ListOfSubjects();
Subject Sub;
Subject SubjectToFind;
Sub = new Subject();
Sub.SubjectName = "Maths";
Subjects.Add(Sub);
Console.WriteLine(" === Output ===");
Console.WriteLine("Number of Subjects: {0}", Subjects.Count);
for (int i = 0; i < Subjects.Count; i++)
{
Subject s = Subjects.Retrieve(i);
Console.WriteLine("\nSubjects Information");
Console.WriteLine("Subject Name: {0}", Sub.SubjectName);
}
SubjectToFind = new Subject();
SubjectToFind.SubjectName = "Maths";
bool Found = Subjects.Find(SubjectToFind);
if (Found == true)
Console.WriteLine("\nItem was found\n");
else
Console.WriteLine("\nItem not found\n");
Console.ReadKey();
return 0;
}
}
