vb中else 和if的问题
Private Sub Command1_Click()Dim x1 As Double, y1 As Double, r As Double, x2 As Double, y2 As Double, r1 As Double, r2 As Double
r1 = 50: r2 = 70: r = 0
x1 = Text1.Text: x2 = Text3.Text: y1 = Text2.Text: y2 = Text4.Text
Do While Abs(chaoyue(x1, y1, x2, y2, r)) > 0.00001
r = (r1 + r2) / 2
If chaoyue(x1, y1, x2, y2, r) = 0 Then Text5.Text = r
Else
If chaoyue(x1, y1, x2, y2, r) < 0 Then r1 = r
Else: r2 = r
End If
End If
Loop
Text5.Text = r
End Sub
这个一直提示else无if why？？？？
大侠们@！ --------------------编程问答-------------------- If chaoyue(x1, y1, x2, y2, r) = 0 Then Text5.Text = r
写到一行就表示是一个完整的if语句，后面没有else或endif --------------------编程问答-------------------- 把IF...then...改成
IF...then
....
--------------------编程问答-------------------- 兄弟，少了一个if，当然提示了！
Private Sub Command1_Click()
Dim x1 As Double, y1 As Double, r As Double, x2 As Double, y2 As Double, r1 As Double, r2 As Double
r1 = 50: r2 = 70: r = 0
x1 = Text1.Text: x2 = Text3.Text: y1 = Text2.Text: y2 = Text4.Text
Do While Abs(chaoyue(x1, y1, x2, y2, r)) > 0.00001
r = (r1 + r2) / 2
If chaoyue(x1, y1, x2, y2, r) = 0 Then
Text5.Text = r
Else
If chaoyue(x1, y1, x2, y2, r) < 0 Then
r1 = r
Else
r2 = r
End If
End If
Loop
Text5.Text = r
End Sub
--------------------编程问答-------------------- 少了还不止一个啊 --------------------编程问答-------------------- If chaoyue(x1, y1, x2, y2, r) = 0 Then Text5.Text = r
Else
If chaoyue(x1, y1, x2, y2, r) < 0 Then r1 = r
Else: r2 = r
End If
改为以下的试试:
If chaoyue(x1, y1, x2, y2, r) = 0 Then
Text5.Text = r
Else
If chaoyue(x1, y1, x2, y2, r) < 0 Then r1 = r Else r2 = r
End If --------------------编程问答--------------------
正解！
补充：VB , 非技术类
