Vb.net VB计算器始终显示0,且if/then/else结果不正确
我试图使用Visual Basic制作一个完整的计算器,但我似乎遇到了以下错误。当我点击任何操作按钮时,我从if/then/else语句中得到了错误的结果。它没有分配所有的布尔值等。它给了我一条错误消息,这条消息应该只出现在用户错误中,即点击一个操作两次等。在注释完这一部分后,我发现了另一个错误,点击等于后,答案总是零,我不确定为什么。谢谢你的帮助Vb.net VB计算器始终显示0,且if/then/else结果不正确,vb.net,Vb.net,我试图使用Visual Basic制作一个完整的计算器,但我似乎遇到了以下错误。当我点击任何操作按钮时,我从if/then/else语句中得到了错误的结果。它没有分配所有的布尔值等。它给了我一条错误消息,这条消息应该只出现在用户错误中,即点击一个操作两次等。在注释完这一部分后,我发现了另一个错误,点击等于后,答案总是零,我不确定为什么。谢谢你的帮助 Public Class frmCalc Dim num1 As Decimal = 0 Dim num2 As Decimal =
Public Class frmCalc
Dim num1 As Decimal = 0
Dim num2 As Decimal = 0
Dim answer As Decimal = 0
Dim cnt As Integer = 10
Dim add As Boolean = False
Dim mult As Boolean = False
Dim div As Boolean = False
Dim subt As Boolean = False
Dim second As Boolean = False
Dim dec As Boolean = False
Dim crash As String = "Error!"
Dim uCrash As String = "User Error."
Dim first As Boolean = True
Public Sub btn1_Click(sender As Object, e As EventArgs) Handles btn1.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 1
ElseIf second = True Then
num2 = (num2 * 10) + 1
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (1 / cnt)
ElseIf second = True Then
num2 = num2 + (1 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn2_Click(sender As Object, e As EventArgs) Handles btn2.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 2
ElseIf second = True Then
num2 = (num2 * 10) + 2
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (2 / cnt)
ElseIf second = True Then
num2 = num2 + (2 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn3_Click(sender As Object, e As EventArgs) Handles btn3.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 3
ElseIf second = True Then
num2 = (num2 * 10) + 3
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (3 / cnt)
ElseIf second = True Then
num2 = num2 + (3 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click
If (add = True) Or (subt = True) Or (mult = True) Or (div = True) Then
add = True
subt = False
mult = False
div = False
dec = False
first = False
second = True
cnt = 10
Else
MessageBox.Show(uCrash)
Application.Exit()
End If
End Sub
Public Sub btn4_Click(sender As Object, e As EventArgs) Handles btn4.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 4
ElseIf second = True Then
num2 = (num2 * 10) + 4
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (4 / cnt)
ElseIf second = True Then
num2 = num2 + (4 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn5_Click(sender As Object, e As EventArgs) Handles btn5.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 5
ElseIf second = True Then
num2 = (num2 * 10) + 5
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (5 / cnt)
ElseIf second = True Then
num2 = num2 + (5 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn6_Click(sender As Object, e As EventArgs) Handles btn6.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 6
ElseIf second = True Then
num2 = (num2 * 10) + 6
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (6 / cnt)
ElseIf second = True Then
num2 = num2 + (6 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btnMult_Click(sender As Object, e As EventArgs) Handles btnMult.Click
If (add = True) Or (subt = True) Or (mult = True) Or (div = True) Then
add = False
subt = False
mult = True
div = False
dec = False
second = True
cnt = 10
Else
MessageBox.Show(uCrash)
Application.Exit()
End If
End Sub
Public Sub btn7_Click(sender As Object, e As EventArgs) Handles btn7.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 7
ElseIf second = True Then
num2 = (num2 * 10) + 7
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (7 / cnt)
ElseIf second = True Then
num2 = num2 + (7 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn8_Click(sender As Object, e As EventArgs) Handles btn8.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 8
ElseIf second = True Then
num2 = (num2 * 10) + 8
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (8 / cnt)
ElseIf second = True Then
num2 = num2 + (8 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btn9_Click(sender As Object, e As EventArgs) Handles btn9.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10) + 9
ElseIf second = True Then
num2 = (num2 * 10) + 9
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
If first = True Then
num1 = num1 + (9 / cnt)
ElseIf second = True Then
num2 = num2 + (9 / cnt)
Else
MessageBox.Show(crash)
Application.Exit()
End If
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btnDiv_Click(sender As Object, e As EventArgs) Handles btnDiv.Click
If (add = True) Or (subt = True) Or (mult = True) Or (div = True) Then
add = False
subt = False
mult = False
div = True
dec = False
second = True
cnt = 10
Else
MessageBox.Show(uCrash)
Application.Exit()
End If
End Sub
Public Sub btnDec_Click(sender As Object, e As EventArgs) Handles btnDec.Click
dec = True
End Sub
Public Sub btn0_Click(sender As Object, e As EventArgs) Handles btn0.Click
If dec = False Then
If first = True Then
num1 = (num1 * 10)
ElseIf second = True Then
num2 = (num2 * 10)
Else
MessageBox.Show(crash)
Application.Exit()
End If
ElseIf dec = True Then
cnt *= 10
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
Public Sub btnEquals_Click(sender As Object, e As EventArgs) Handles btnEquals.Click
If add = True Then
answer = num1 + num2
ElseIf subt = True Then
answer = num1 - num2
ElseIf div = True Then
answer = num1 / num2
ElseIf mult = True Then
answer = num1 * num2
Else
MessageBox.Show(uCrash)
Application.Exit()
End If
MessageBox.Show(answer)
num1 = answer
num2 = 0
first = False
second = False
dec = False
End Sub
Public Sub btnSub_Click(sender As Object, e As EventArgs) Handles btnSub.Click
If (add = True) Or (subt = True) Or (mult = True) Or (div = True) Then
add = False
subt = True
mult = False
div = False
dec = False
second = True
cnt = 10
Else
MessageBox.Show(uCrash)
Application.Exit()
End If
End Sub
Public Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
num1 = 0
num2 = 0
answer = 0
cnt = 10
first = True
second = False
mult = False
add = False
subt = False
div = False
dec = False
End Sub
Public Sub btnBack_Click(sender As Object, e As EventArgs) Handles btnBack.Click
If first = True Then
num1 = num1 - (num1 Mod 10)
ElseIf second = True Then
num2 = num2 - (num2 Mod 10)
Else
MessageBox.Show(crash)
Application.Exit()
End If
End Sub
End Class
你的逻辑似乎颠倒了。如果在按下运算符时
add=True
,则应给出一个错误,因为这意味着您已经按下了add,而不是相反:
If (add = True) Or (subt = True) Or (mult = True) Or (div = True) Then
MessageBox.Show(uCrash)
Application.Exit()
Else
add = False
subt = False
mult = False
div = True
dec = False
second = True
cnt = 10
End If
编辑:我认为检查也可以用
(second=true)
来代替。减少一点代码,例如只保留一个数字、一个运算符和相等按钮不会有什么坏处。代码中大约有50个(猜测)If
s,而您甚至没有突出显示导致问题的一个。