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我的任务是在我们公司的系统中输入每种产品的重量(超过 65,000 种),所以我使用 Excel 和对 vba 的知识有限的知识来尽可能自动化。

计划是,我输入产品名称的一部分,然后输入要输入的数字,然后在工作表上的所有相关行中输入该数字。

问题; 我输入的数字很少超过小数点后 2 位,但是在工作表上输入的数字并不相同 - 总是非常接近,但不完全一样。例如,当我刚刚尝试在相关单元格中输入 0.88 时,它输入了 0.87999995。

代码(简化):

Sub EnterWeight()

Dim Filter As String
Dim Weight As Single

Filter = InputBox("Add text filter", "Add Filter")

w = InputBox("Insert weight in Kg", "Enter Weight", 1) 
'(yes, I know it should be 'mass in Kg', but ... ¯\_(ツ)_/¯ )

Weight = CDec(w)

Debug.Print Weight 'To test that it's the correct number, always seems to be ok.

    For b = 1 To Activesheet.UsedRange.Rows.Count
        If Cells(b, ) Like "*" & Filter & "*" Then 'Find the filter in any part of the cell

            If Cells(b, 2) <> "" And Cells(b, 2).Value <> SG Then 'Cells already populated with a different value

            y = MsgBox("Product """ & Cells(b, 1).Value & _
                """ already has a weight assigned of " & _
                Cells(b, 2).Value & Chr(13) & _
                "OverWrite?", vbYesNo + vbExclamation, _
                "Weight already assigned")
                If y = vbYes Then Cells(b, 2).Value = Weight

            Else
                Cells(b, 2).Value = Weight
            End If

        End If

    Next
End sub

谁能告诉我为什么不能Weight在相关单元格中正确输入变量?通过谷歌搜索似乎没有产生答案,尽管也许我只是问错了问题。

提前谢谢了

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1 回答 1

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这个问题可以最小化为:

Sub test1()
    Dim Weight As Single
    Weight  = InputBox("Insert weight in Kg", "Enter Weight", 1)
    Cells(2, 2).Value = Weight
End Sub

在输入框中输入“.88”会导致单元格收到“0.879999995231628”

但是,将其更改WeightDouble

Sub test2()
    Dim Weight As Double
    Weight  = InputBox("Insert weight in Kg", "Enter Weight", 1)
    Cells(2, 2).Value = Weight
End Sub

在输入框中输入“.88”会使单元格收到“0.88”


查看VBA Double vs Single rounding的答案,以非常详细地解释为什么会发生这种情况。

于 2020-03-12T13:51:26.743 回答