问题描述
我正在做一个计算器项目,用2个操作数完成,但是努力编写代码并求解3个操作数calc。问题是当我这样做时,例如10 + 10 =(答案20)工作正常,但10 + 10 + 10 =(也答案20)。似乎忘记了第一个变量。
以下是我在vb2010上的代码,请告知我是否错过了什么。谢谢。
Dim first As Double
Dim second As Double
Dim third As Double
Dim answer As Double
Dim process As String
Private Sub Button15_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button15.Click
first = Val(TextBox1.Text)
TextBox1.Text = ""
formula.Text = first & "x"
process = "*"
End Sub
Private Sub Button14_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button14.Click
first = Val(TextBox1.Text)
TextBox1.Text = ""
formula.Text = first & "+"
process = "+"
End Sub
Private Sub Button12_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button12.Click
first = "0"
second = "0"
answer = "0"
formula.Text = ""
TextBox1.Text = ""
End Sub
Private Sub Button16_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button16.Click
If process = "+" Then
second = Val(TextBox1.Text)
formula.Text = first & "+" & second & "="
answer = first + second
TextBox1.Text = answer
End If
If process = "*" Then
second = Val(TextBox1.Text)
formula.Text = first & "x" & second & "="
answer = first * second
TextBox1.Text = answer
End If
If process = "/" Then
second = Val(TextBox1.Text)
formula.Text = first & "÷" & second & "="
answer = first / second
TextBox1.Text = answer
End If
If process = "-" Then
second = Val(TextBox1.Text)
formula.Text = first & "-" & second & "="
answer = first - second
TextBox1.Text = ""
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button2.Click
first = Val(TextBox1.Text)
TextBox1.Text = ""
formula.Text = first & "-"
process = "-"
End Sub
Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
first = Val(TextBox1.Text)
TextBox1.Text = ""
formula.Text = first & "÷"
process = "/"
End Sub
解决方法
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