ft...两个循环体?
Private Sub Command1_Click()
Dim d As Integer, s As Integer, n As Integer, i As Integer
n = CInt(Text2.Text)
d = 1
s = 0
For i = 1 to n
s = s + n * d
d = - d
Next i
Text1.Text = s
End Sub
Private Sub Command1_Click()
Dim d As Integer, s As Integer, n As Integer, i As Integer
n = CInt(Text2.Text)
d = 1
s = 0
For i = 1 to n
s = s + n * d
d = - d
Next i
Text1.Text = s
End Sub
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Dim i As Integer, s As Integer
' Text1.Text = 3
For i = 1 To Val(Text1.Text)
s = s + i * (-1) ^ (i + 1)
Next i
Text2.Text = s
End Sub
Dim a As Integer, b As Integer, c As Integer, d As Integer
a = CInt(Text1.Text)
b = 1
Do While c < a
c = c + 1
d = d + b * c
b = -b
Loop
Text2.Text = d
End Sub
Dim d As Integer, s As Integer, n As Integer, i As Integer
n = CInt(Text2.Text)
d = 1
s = 0
For i = 1 to n
s = s + i * d '原先是 s = s + n * d 错的
d = - d
Next i
Text1.Text = s
End Sub