'自定義一個(gè)函數(shù):功能是給小數(shù)直接進(jìn)一位
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'num 要操作的小數(shù)
'n 保留幾位小數(shù),
Function getNumber(num As Double, n As Integer) As Double
Dim a As Double
a = Int(num * (10 ^ n)) / (10 ^ n)
If a = num Then
getNumber = a
Else
getNumber = a + 1 / (10 ^ n)
End If
End Function
-------------------------
調(diào)用一下:
Private Sub Command1_Click()
MsgBox (getNumber(3.1415926, 2))
End Sub
得到3.15
在VB中是這樣的,沒學(xué)過VB點(diǎn)虐 ,你變換一下就可以了
Option
Explicit
Private
Sub
Command1_Click()
Dim
Num(2)
Num(0)
=
Val(Left(Label1.Caption,
2))
Num(1)
=
Val(Mid(Label1.Caption,
3,
1))
Num(2)
=
Val(Right(Label1.Caption,
2))
MsgBox
"Num(0)="
Num(0)
vbCrLf
"Num(1)="
Num(1)
vbCrLf
"Num(2)="
Num(2)
'如果想測(cè)試是不是可以計(jì)算,可以用這一句
'MsgBox
"Num(0)+1="
Num(0)
+
1
vbCrLf
"Num(1)+1="
Num(1)
+
1
vbCrLf
"Num(2)+1="
Num(2)
+
1
End
Sub
Private
Sub
Form_Load()
Label1.Caption
=
"12345"
End
Sub
用字符串保存兩個(gè)數(shù)據(jù),當(dāng)然只有你這種辦法,另外提供你其它思路:
1. flexcell增加兩列,這兩列隱藏不顯示,額外數(shù)據(jù)可以從這兩列讀取
2. 用自定義類型數(shù)組,保存這兩列數(shù)據(jù),數(shù)組順序和表格一樣,或者數(shù)組中增加一個(gè)ID元素,與表格對(duì)應(yīng)
Dim num As Integer
Dim connstr, insertcmd, selectcmd As String
connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\360data\重要數(shù)據(jù)\我的文檔\hd.mdb"
Dim conn As OleDbConnection
Dim cmd, cmd1 As OleDbCommand
conn = New OleDbConnection(connstr)
Dim r As OleDbDataReader
conn.Open()
insertcmd = "insert into returnbooks (aid,aname,ISBN,bname,renum,reday) values("
Val(ComboBox1.Text) ",'"
TextBox2.Text "','"
ComboBox2.Text "','"
TextBox2.Text "',"
Val(TextBox3.Text) ",'"
CType(TextBox4.Text, Date) "' )"
cmd = New OleDbCommand(insertcmd, conn)
cmd.ExecuteNonQuery()
updatecmd = "update books set remainnum=" Val(num) "-" Val(TextBox3.Text) " where ISBN='" ComboBox2.Text "'"
cmd = New OleDbCommand(updatecmd, conn)
cmd.ExecuteNonQuery()
updatecmd = "select remainnum as num from books where ISBN= '" ComboBox2.Text "'"
cmd = New OleDbCommand(updatecmd, conn)
cmd.ExecuteNonQuery()
updatecom = "update books set remainnum=num+ " Val(TextBox3.Text) ""
cmd = New OleDbCommand(updatecmd, conn)
cmd.ExecuteNonQuery()
selectcmd = "select remainnum from books where ISBN='" ComboBox2.Text "'"
cmd1 = New OleDbCommand(selectcmd, conn)
r = cmd1.ExecuteReader()
If (r.Read()) Then '如果sql查詢到了數(shù)據(jù)
num = r.GetInt32(0)
End If
conn.Close()
/*注意代碼的格式,不然改起來太費(fèi)時(shí)間*/
標(biāo)題名稱:包含vb點(diǎn)虐
num的詞條
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