实现上述功能的VB程序代码如下，但加框处代码有错，请改正。

Private Sub Command1_Click()

  Dim s As String, ch As String

  Dim ch2 As String, sum As Double

  Dim n As Integer, i As Integer

  s = Text1.Text

  n = Len(s)

  i = 1: sum = 0

  Do While                                    ＇①

    ch = Mid(s, i, 1)

    If ch >= "0" And ch <= "9" Then

      j = i

      ch2 = Mid(s, j, 1)

      Do While ch2 >= "0" And ch2 <= "9"

        j = j + 1

        ch2 = Mid(s, j, 1)

      Loop

      sum = sum + Val（ ）     ＇②

      i = j

    End If

    i = i + 1

  Loop

  Label3.Caption = Str(sum)

End Sub

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实现上述功能的VB程序如下，但划线部分代码有错，请改正。

Private Sub Command1_Click()

  Dim x(1 To 100) As Single， y(1 To 100) As Single

  Dim tmp As Single， length As Single， sum As Single， x1 As Single， y1 As Single

  Dim i As Integer， j As Integer， k As Integer

Randomize 

List1.Clear

  k = Val(Text1.Text)

  For i = 1 To k

      x(i) = Int(Rnd * 90) / 10 + 1

      y(i) = Int(Rnd * 90) / 10 + 1

      List1.AddItem "X：" + Str(x(i)) + "   " + "Y：" + Str(y(i))

  Next i

  For i = 1 To k - 1

      For j = 1 To k - i

          If x(j) > x(j + 1) Then

              x(i)=x(i) + x(j)

              x(j) = x(i) - x(j)

              x(j) = x(i) + x(j)   ‘①

              tmp = y(j)

              y(j) = y(j + 1)

              y(j + 1) = tmp

          End If

      Next j

  Next i

  sum = 0： length = 0

  For i = 1 To k - 1

      x1 = (x(i) - x(1)) ^ 2     ‘②

 '变量y1计算方法同x1，代码略

      length = Sqr(x1 + y1)

      sum = sum + length

  Next i

  Text2.Text = Str(Int(sum * 10) / 10)

End Sub

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