VB成的 计算周长和面积

Private Sub Command1_Click()
Dim a, b, mj, zhch As Integer
a = Val(Text1.Text)
b = Val(Text2.Text)
If a = 0 Or b = 0 Then
MsgBox "你见过没有长或宽的矩形吗", vbOKOnly, "提示"
Else
zhch = (a + b) * 2
Text4.Text = zhch
mj = a * b
Text3.Text =[……]

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