VBA Sort RossetaCode

Public Sub Quick(a() As Variant, last As Integer)
' quicksort a Variant array (1-based, numbers or strings)
Dim aLess() As Variant
Dim aEq() As Variant
Dim aGreater() As Variant
Dim pivot As Variant
Dim naLess As Integer
Dim naEq As Integer
Dim naGreater As Integer
 
If last > 1 Then
    'choose pivot in the middle of the array
    pivot = a(Int((last + 1) / 2))
    'construct arrays
    naLess = 0
    naEq = 0
    naGreater = 0
    For Each el In a()
      If el > pivot Then
        naGreater = naGreater + 1
        ReDim Preserve aGreater(1 To naGreater)
        aGreater(naGreater) = el
      ElseIf el < pivot Then
        naLess = naLess + 1
        ReDim Preserve aLess(1 To naLess)
        aLess(naLess) = el
      Else
        naEq = naEq + 1
        ReDim Preserve aEq(1 To naEq)
        aEq(naEq) = el
      End If
    Next
    'sort arrays "less" and "greater"
    Quick aLess(), naLess
    Quick aGreater(), naGreater
    'concatenate
    P = 1
    For i = 1 To naLess
      a(P) = aLess(i): P = P + 1
    Next
    For i = 1 To naEq
      a(P) = aEq(i): P = P + 1
    Next
    For i = 1 To naGreater
      a(P) = aGreater(i): P = P + 1
    Next
End If
End Sub
 
Public Sub QuicksortTest()
Dim a(1 To 26) As Variant
 
 'populate a with numbers in descending order, then sort
 For i = 1 To 26: a(i) = 26 - i: Next
 Quick a(), 26
 For i = 1 To 26: Debug.Print a(i);: Next
 Debug.Print
 'now populate a with strings in descending order, then sort
 For i = 1 To 26: a(i) = Chr$(Asc("z") + 1 - i) & "-stuff": Next
 Quick a(), 26
 For i = 1 To 26: Debug.Print a(i); " ";: Next
 Debug.Print
End Sub

Source: rosettacode.org

Similar codes

0 vote174 views1 answer
Vba shape transparent
VBA
0 vote179 views1 answer
Vba word pdf table to excel
VBA
11 votes235 views1 answer
Excel vba How to URL encode a string
VBA
0 vote173 views1 answer
Excel vba protect content
VBA
1 vote215 views1 answer
Perform http request in vb.net
VBA
3 votes186 views1 answer
Vba not equal
VBA
1 vote166 views1 answer
Close form vba
VBA
1 vote186 views1 answer
Vba login website
VBA
1 vote189 views1 answer
Set font for ms chart vb.net
VBA
0 vote176 views1 answer
Vb get ip address
VBA