实现上述功能的VB程序如下，但横线处代码有错，请改正。

Private Sub Command1_Click()

    Dim a As String

    Dim x As Integer, s As Integer, k As Integer

    a = Text1.Text

    x = 1: s = 0: k = 0

    For i = 1 To Len(a)

        '如果输入的不是0到9的数字或者空格，则给出错误提示后结束子程序

        If (Asc(Mid(a, i, 1)) < 48 Or Asc(Mid(a, i,1)) > 57)  or(Asc(Mid(a,i,1))= 32)  then’{#blank#}1{#/blank#}Label1.Caption = "只能输入数字或空格"

            Exit Sub

        End If

        If Mid(a, i, 1) = " " Then

            s = s + Mid(a,x,i)’{#blank#}2{#/blank#}

            x = i + 1

            k = k + 1

        End If

    Next i

    Label1.Caption = "这" + Str(k) + "个数的和为:" + Str(s)

End Sub

Dim a(1 To 5) As Integer

Dim f As Boolean

a(1) = 23: a(2) = 12: a(3) = 56: a(4) = 34: a(5) = 10

i = 1: f = True

Do While i <= 5 And f = True

  If a(i) = 56 Then f = False

  i = i + 1

Loop

Label1.Caption = i

    m=1：k=1

    For i=2 To 10

      If a(i)<a(i-1)Then

    k=k+1

         If k>m Then m=k

       Else

         k=1

       End If

    Next i

    Text1．Text=Str(m)

  End Sub

执行该程序段，文本框Text1中显示的是 （  ）

a=a-b

a=a*b