Computer Science 9608
4.1 Computational thinking and problem-solving
4.1.2 Algorithms
Topic: Write algorithms to insert & find an item in Hash Table
Module Module1
Dim studArr(10) As Integer
Sub Main()
Dim RK, x As Integer
For x = 0 To 10
Console.Write("Enter Record Key :") : RK = Console.ReadLine
Call InsertHash(RK)
Next
Console.Write("Enter Search Record Key :") : RK = Console.ReadLine
x = SearchHash(RK)
If x = 0 Then
Console.WriteLine("Not Found")
Else
Console.WriteLine("Found")
End If
Console.ReadKey()
For x = 0 To 10
Console.WriteLine(studArr(x))
Next
Console.ReadKey()
End Sub
Sub InsertHash(ByVal RecKey As Integer)
Dim hashKey As Integer
hashKey = Hash(RecKey, 10)
While studArr(hashKey) <> 0
hashKey = hashKey + 1
If hashKey > 10 Then hashKey = 0
End While
studArr(hashKey) = RecKey
End Sub
Function SearchHash(ByVal RecKey As Integer) As Integer
Dim hashKey, totSearches As Integer
hashKey = Hash(RecKey, 10)
While studArr(hashKey) <> RecKey
totSearches = totSearches + 1
hashKey = hashKey + 1
If hashKey > 10 Then hashKey = 0
If totSearches > 10 Then
Return 0
Exit Function
End If
End While
Return RecKey
End Function
Function Hash(ByVal KeyVal As Integer, ByVal MaxPos As Integer) As Integer
Dim indexPos As Integer
indexPos = Keyval Mod (MaxPos + 1)
Return indexPos
End Function
End Module
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