static void TestHashTable()
{
Console.WriteLine("test hash table");
HashTable hashTable = new HashTable(11, 2);
char s = 'a';
for (int i = 0; i < 10; i++, s++)
{
hashTable.Put(new string(s, 10));
}
foreach (string item in hashTable.slots)
{
Console.WriteLine(item + " ");
}
Console.WriteLine();
Console.WriteLine("put z string");
hashTable.Put(new string('z', 10));
foreach (string item in hashTable.slots)
{
Console.WriteLine(item + " ");
}
Console.WriteLine();
Console.WriteLine("try to put 'end'");
int position = hashTable.Put("end");
Console.WriteLine("result position = " + position);
Console.WriteLine("find values test");
s = 'a';
for (int i = 0; i < 10; i++, s++)
{
string value = new string(s, 10);
position = hashTable.Find(value);
Console.WriteLine("position = " + position + ", value = " + value);
}
Console.WriteLine(new string('=', 50));
}
static void TestHashFunctions()
{
int tableSize = 50;
int[] values = new int[tableSize];
Random rnd = new Random();
for (int i = 0; i < tableSize; i++)
{
int newValue = rnd.Next(0, 5000);
values[i] = newValue;
Console.Write(newValue + " ");
}
List <Func <int, int> > hashFunctions = new List <Func <int, int> >
{
x => ((7 * x + 5) % 17) % tableSize,
x => ((3 * x + 1) % 13) % tableSize,
x => ((17 * x + 13) % 31) % tableSize
};
HashTable <int> hashTable = new HashTable <int>(tableSize, 3, hashFunctions[0]);
Console.WriteLine(Environment.NewLine + "test put values" + Environment.NewLine);
for (int i = 0; i < values.Length / 2; i++)
{
hashTable.Put(values[i]);
}
foreach (var t in hashTable.slots)
{
Console.Write(t + " ");
}
Console.WriteLine();
Console.WriteLine(Environment.NewLine + "test put values" + Environment.NewLine);
hashTable = new HashTable <int>(tableSize, 3, hashFunctions[1]);
for (int i = 0; i < values.Length / 2; i++)
{
hashTable.Put(values[i]);
}
foreach (var t in hashTable.slots)
{
Console.Write(t + " ");
}
Console.WriteLine();
Console.WriteLine(Environment.NewLine + "test put values" + Environment.NewLine);
hashTable = new HashTable <int>(tableSize, 3, hashFunctions[2]);
for (int i = 0; i < values.Length / 2; i++)
{
hashTable.Put(values[i]);
}
foreach (var t in hashTable.slots)
{
Console.Write(t + " ");
}
Console.WriteLine();
Console.WriteLine(new string('=', 50));
}
