last time: redim
resize an array

using a for each loop

  For Each letter in sentence.ToCharArray()
    If (letter >= "A") And (letter <= "Z") Then
      index = Asc(letter) - 65  'The ANSI value of "A"is 65
      charCount(index) += 1
    End If
  Next

how freq table might be useful
huffman trees



http://en.wikipedia.org/wiki/Huffman_coding

AN example of using freq tables

"If arrayOne() and arrayTwo() have been declared with the same data type, then the statement

arrayOne = arrayTwo
makes arrayOne() an exact duplicate of arrayTwo(). It will have the same size and contain the same information.

"

This comment is false. fixed in later versions of the book




so, how DO we copy an array?

two ways:
1)
Dim a(4) As Integer = {6, 8, 2, -8, 0}
Dim b() as Integer
' i want to make b an exact duplicate of a
ReDim b(UBound(a))
For I = 0 to UBound(a)
    b(i) = a(i)
Next

2)
b = a.Clone()

HW: arrays, creating and accessing
q 28, 32