两位数乘法

Option Base 1

 

Private Sub Command1_Click()

 

 

    Dim M As String

    Dim N As String

 

    M = Trim(Text1.Text)

    N = Trim(Text2.Text)

 

    Dim Number1() As Byte

    Dim Number2() As Byte

 

    ReDim Number1(Len(M))

    ReDim Number2(Len(N))

 

    Dim index As Byte

 

    For index = 1 To Len(M) Step 1

        Number1(index) = Mid(M, index, 1)

    Next index

       

    For index = 1 To Len(N) Step 1

        Number2(index) = Mid(N, index, 1)

    Next index

     

  Dim Result() As Byte

  ReDim Result(Len(M) + Len(N))

 

  Dim MCarry As Byte

  Dim ACarry As Byte

  Dim Remainder As Integer

 

  Dim i As Integer, j As Integer

  Dim Mtemp As Integer, Atemp As Integer

 

  For i = Len(N) To 1 Step -1

    For j = Len(M) To 1 Step -1

        Mtemp = Number1(j) * Number2(i) + MCarry

        MCarry = Mtemp \ 10

        Remainder = Mtemp Mod 10

        Atemp = Remainder + Result(i + j) + ACarry

        ACarry = Atemp \ 10

        Result(i + j) = Atemp Mod 10