VBA中的各种循环
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VBA中的各种循环利⽤循环和分⽀语句判断 B 列数字的符号，将结果填⼊ C列。
原始表格如如下：
1、For 循环和 If 语句，代码如下：
Sub sign()
Dim sign As String, i As Integer'声明变量
For i = 3To13Step1
If Cells(i, "B") < 0Then
sign = "负数"
ElseIf Cells(i, "B") > 0Then
sign = "正数"
Else
sign = "零"
End If
Cells(i, "C") = sign '向 C 列对应单元格中写⼊数据
Next i
End Sub
运⾏代码，结果如下：
2、For 循环和 Select Case 语句，代码如下：
Sub sign()
Dim sign As String, i As Integer'声明变量
For i = 3To13Step1
Select Case Cells(i, "B")
Case Is < 0
sign = "负数"
Case Is > 0
sign = "正数"
Case Else
sign = "零"
End Select
Cells(i, "C") = sign '向 C 列对应单元格中写⼊数据
Next i
End Sub
3、Do While 循环和 Select Case 语句，代码如下：
Sub sign()
Dim sign As String, i As Integer '声明变量
i = 3 '初始化循环变量
Do While Cells(i, "B") <> ""
Select Case Cells(i, "B")
Case Is < 0
sign = "负数"
Case Is > 0
sign = "正数"
Case Else
sign = "零"
End Select
Cells(i, "C") = sign '向 C 列对应单元格中写⼊数据 i = i + 1 '更新哨兵变量
Loop
End Sub
4、Do Until 循环和 Select Case 语句，代码如下：
Sub sign()
Dim sign As String, i As Integer '声明变量
i = 3 '初始化循环变量
Do Until Cells(i, "B") = ""
Select Case Cells(i, "B")
Case Is < 0
sign = "负数"
Case Is > 0
sign = "正数"
Case Else
sign = "零"
End Select
Cells(i, "C") = sign
i = i + 1 '更新循环变量
Loop
End Sub。