public void Insert(studentRecord newRecord)
{
int key = newRecord.getstudentId();
int h = hash(key);
int location = h;
for (int i = 1; i < m; i++)
{
if (array[location] == null || array[location].getstudentId() == -1)
{
array[location] = newRecord;
n++;
return;
}
if (array[location].getstudentId() == key)
{
throw new System.InvalidOperationException("Duplicate key");
}
location = (h + i) % m;
}
Console.WriteLine("Table is full : Record can't be inserted ");
}
public studentRecord Delete(int key)
{
int h = hash(key);
int location = h;
for (int i = 1; i < m; i++)
{
if (array[location] == null)
{
return(null);
}
if (array[location].getstudentId() == key)
{
studentRecord temp = array[location];
array[location].setstudentId(-1);
n--;
return(temp);
}
location = (h + i) % m;
}
return(null);
}
static void Main(string[] args)
{
int id, choice;
String name;
Console.Write("Enter initial size of 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. Exit");
Console.WriteLine("Enter your choice : ");
choice = Convert.ToInt32(Console.ReadLine());
if (choice == 5)
{
break;
}
switch (choice)
{
case 1:
Console.WriteLine("Enter student id : ");
id = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter student name : ");
name = Console.ReadLine();
studentRecord aRecord = new studentRecord(id, name);
table.Insert(aRecord);
break;
case 2:
Console.Write("Enter a key to be searched : ");
id = Convert.ToInt32(Console.ReadLine());
aRecord = table.Search(id);
if (aRecord == null)
{
Console.WriteLine("Key not found\n");
}
else
{
Console.WriteLine(aRecord.toString());
}
break;
case 3:
Console.Write("Enter a key to be deleted : ");
id = Convert.ToInt32(Console.ReadLine());
table.Delete(id);
break;
case 4:
table.DisplayTable();
break;
}
}
}