第13週WORD巨集+表單+TypeText+TypeParagraph+字串

Const period As Integer = 4
Const maxerror As Double = 0.0000001
Dim payment(period) As Double '廣域變數 4 維度的陣列
Private Sub CommandButton1_Click()
  Dim a, b, c, f, gap As Double
  Dim loopNumber As Integer
  a = 0
  b = 1
  gap = 10
  loopNumber = 10
  payment(0) = TextBox1.Value
  payment(1) = TextBox2.Value
  payment(2) = TextBox3.Value
  payment(3) = TextBox4.Value
  f = npv(a)
  If f = 0 Then
     Label9.Caption = 0
  ElseIf f < 0 Then
     Label9.Caption = "內部報酬率小於 0."
  Else
     Do While gap > mexerror And Abs(f) > maxerror And loopNumber < 100
       loopNumber = loopNumber + 1
       c = (a + b) / 2
       f = npv(c)
       If Abs(f) > maxerror And gap > maxerror Then
          If f > 0 Then
            a = c
          Else
            b = c
            gap = b - a
          End If
        Else
          Label9.Caption = c
       End If
     Loop
  End If
  Label10.Caption = f
  Label11.Caption = loopNumber
  '以下是將結果輸出到WORD\
  Selection.TypeText ("躉繳:" & TextBox1.Value & ", 第1期:" & TextBox2.Value & ", 第2期:" & TextBox3.Value & ", 第3期:" & TextBox4.Value)
  Selection.TypeParagraph
  Selection.TypeText ("內部報酬率%:" & c * 100)
  Selection.TypeParagraph
  Selection.TypeText ("淨現值:" & f)
  Selection.TypeParagraph
  Selection.TypeText ("迴圈次數:" & loopNumber)
  Selection.TypeParagraph
End Sub
Private Sub CommandButton2_Click()
  End
End Sub
Function npv(rate) '計算特定折現率rate的淨現值
  Dim y As Double
  Dim j As Integer
  y = -payment(0)
  For j = 1 To period
      y = y + payment(j) / (1 + rate) ^ j
  Next
  npv = y
End Function