关于VB编程（急）

代码如下：

private Sub Command1_Click()

If Combo1.Text = "△型连接" And Combo2.Text = "a连y、b连z、c连x" Then

Dim p As Single

For i = 1 To VSFlexGrid1.Cols - 1

a = Val(VSFlexGrid1.TextMatrix(1, i))

b = Val(VSFlexGrid1.TextMatrix(2, i))

c = Val(VSFlexGrid1.TextMatrix(3, i))

p = (a + b + c) / 3

VSFlexGrid1.TextMatrix(4, i) = (b - p) - a * c / (b - p)

VSFlexGrid1.TextMatrix(5, i) = (a - p) - b * c / (a - p)

VSFlexGrid1.TextMatrix(6, i) = (c - p) - a * b / (c - p)

Next i

For i = 1 To VSFlexGrid1.Rows - 1

For j = 0 To VSFlexGrid1.Cols - 1

If Val(VSFlexGrid1.TextMatrix(i, j)) = 0 Then VSFlexGrid1.TextMatrix(i, j) = ""

Next j

Next i

End If

end sub

Private Sub Form_Load()

VSFlexGrid1.TextMatrix(0, 0) = "档位"

VSFlexGrid1.TextMatrix(0, 1) = "Ⅰ"

VSFlexGrid1.TextMatrix(0, 2) = "Ⅱ"

VSFlexGrid1.TextMatrix(0, 3) = "Ⅲ"

VSFlexGrid1.TextMatrix(0, 4) = "Ⅳ"

VSFlexGrid1.TextMatrix(0, 5) = "Ⅴ"

VSFlexGrid1.TextMatrix(0, 5) = "Ⅵ"

VSFlexGrid1.TextMatrix(0, 6) = "Ⅶ"

VSFlexGrid1.TextMatrix(0, 7) = "Ⅷ"

VSFlexGrid1.TextMatrix(0, 8) = "Ⅸ"

VSFlexGrid1.TextMatrix(1, 0) = "AB"

VSFlexGrid1.TextMatrix(2, 0) = "AC"

VSFlexGrid1.TextMatrix(3, 0) = "BC"

VSFlexGrid1.TextMatrix(4, 0) = "A"

VSFlexGrid1.TextMatrix(5, 0) = "B"

VSFlexGrid1.TextMatrix(6, 0) = "C"

Combo1.AddItem "Y型连接"

Combo1.AddItem "△型连接"

Combo2.AddItem "a连y、b连z、c连x"

Combo2.AddItem "a连z、b连x、c连y"

End Sub

问题1：我运行调试的时候在 VSFlexGrid1.TextMatrix(4, i) = (b - p) - a * c / (b - p)这行显示黄色，提示是“溢出”

问题2：在表里输入数字时再点一下其它地方的表格，列方向的 “AB”“AC”“BC”等都不显示了。（刚开始运行的时候是有显示的）

说详细点

谢谢

我运行调试的时候在 VSFlexGrid1.TextMatrix(4, i) = (b - p) - a * c / (b - p)这行显示黄色，提示是“溢出”，我测试时是(b - p)=0