public StudentRecord Delete(int key)
{
int h = hash(key);
int location = h;
for (int i = 0; i < length; i++)
{
if (Records[location] == null)
{
return(null);
}
if (Records[location].StudentId == key)
{
StudentRecord temp = Records[location];
Records[location].StudentId = -1;
NumOfRecords--;
return(temp);
}
location = (h + i) % length;
}
return(null);
}
static void Main(string[] args)
{
int id, choice;
string name;
Console.Write("Enter initial size of the table");
int size = Convert.ToInt32(Console.ReadLine());
HashTable table = new HashTable(size);
while (true)
{
Console.WriteLine("1. Insert a record");
Console.WriteLine("2. Search a record");
Console.WriteLine("3. Delete a record");
Console.WriteLine("4. Display Table");
Console.WriteLine("5. Break");
Console.WriteLine("Enter a choice");
choice = Convert.ToInt32(Console.ReadLine());
switch (choice)
{
case 1:
Console.WriteLine("Enter Student ID");
id = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter Student Name");
name = Console.ReadLine();
StudentRecord rec = new StudentRecord(id, name);
table.Insert(rec);
break;
case 2:
Console.WriteLine("Enter a key to be searcehd");
id = Convert.ToInt32(Console.ReadLine());
rec = table.SearchStudent(id);
if (rec == null)
{
Console.WriteLine("Key not found");
}
else
{
Console.WriteLine(rec.ToString());
}
break;
case 3:
Console.WriteLine("Enter a key to be deleted");
id = Convert.ToInt32(Console.ReadLine());
table.Delete(id);
break;
case 4:
table.DisplayTable();
break;
case 5:
default:
break;
}
}
}