Question

我已经从这里的问题中研究和阅读了所有内容，但是我所尝试的并没有解决问题。该函数用于向应用程序输出字母等级。以下是类和函数的代码，以便更清晰。

Public Class Coursegrade
'names private veriables 
Private _Score1 As Integer
Private _Score2 As Integer
Private _Score3 As Integer
Private Letter_grade As String
'gets and returns each veriable
'for application use
Public Property Grade As String
    Get
        Return Letter_grade
    End Get
    Set(value As String)
        If value > String.Empty Then
            Letter_grade = value
        Else
            Letter_grade = String.Empty
        End If
    End Set
End Property
Public Property TestScore1 As Integer
    Get
        Return _Score1
    End Get
    Set(value As Integer)
        If value > 0 Then
            _Score1 = value
        Else
            _Score1 = 0
        End If
    End Set
End Property


Property TestScore2 As Integer
    Get
        Return _Score2
    End Get
    Set(value As Integer)
        If value > 0 Then
            _Score2 = value
        Else
            _Score2 = 0
        End If
    End Set
End Property

Public Property TestScore3 As Integer
    Get
        Return _Score3
    End Get
    Set(value As Integer)
        If value > 0 Then
            _Score3 = value
        Else
            _Score3 = 0
        End If
    End Set
End Property

'starts veriables of at 0
Public Sub New()
    _Score1 = 0
    _Score2 = 0
    _Score3 = 0
End Sub
'calculates the adverage
Public Function Gettotal() As Integer
    Return _Score1 + _Score2 + _Score3
End Function


Public Function Give_letter_grade() As String
    Dim intTotal As Integer
    intTotal = Gettotal()

    'start your secletion
    If intTotal <= 270 AndAlso intTotal >= 300 Then
        Letter_grade = "A"
    ElseIf intTotal <= 240 AndAlso intTotal >= 269 Then
        Letter_grade = "B"
    ElseIf intTotal <= 210 AndAlso intTotal >= 239 Then
        Letter_grade = "C"
    ElseIf intTotal <= 180 AndAlso intTotal >= 290 Then
        Letter_grade = "D"
    ElseIf intTotal > 180 Then
        Letter_grade = "F"
    Else

        Letter_grade = ""
    End If
End Function

错误显示在给出字母等级

的结束函数上

Answer 1

idname a  c name
1      b  d  elisa1
2      b  d  elisa2
3      b  d  elisa3

我如何解决＆＃39;函数不会在所有代码路径上返回值＆＃39;

1 个答案: