VBA 代码报错：变量声明和语法错误修正

在给出的代码中，存在一些语法错误。修复代码如下：

Private Sub CommandButton1_Click()
    Dim unsentqty As Double
    Dim tax As Double
    Dim nontaxprice As Double
    Dim taxprice As Double
    Dim sumincltaxprice As Double
    Dim sumnontaxprice As Double
    Dim qty As Double
    
    Dim result1 As Double
    Dim result2 As Double
    Dim result3 As Double
    Dim result4 As Double
    
    If Not IsEmpty(TextBox7.Value) Then
        '将TextBox7转换为数值类型
        qty = CDbl(TextBox7.Value)
        
        '计算相乘结果
        result1 = qty
        
        '将result1的值赋给TextBox8
        TextBox8.Value = result1
    Else
        TextBox8.Value = ""
    End If
End Sub

修正的改动包括：

每个变量声明应单独指定类型。
'result1, result2, result3, result4' 都应指定为 'As Double'。
最后一行的 'endsub' 应更正为 'End Sub'。