Question

vb.net中如何随机出现运算符“+”“-”“*”“/“

Answer 1

你可以换个思路嘛，随机数只能显示数字，但也可以转换为符号
Dim a
Private Sub Button1_Click(ByVal sender As System.Object， ByVal e As System.EventArgs) Handles Button1.Click
Randomize()
a = Int(Rnd() * 4) + 1
Select Case a
Case 1
TextBox1.Text = "+"
Case 2
TextBox1.Text = "-"
Case 3
TextBox1.Text = "*"
Case 4
TextBox1.Text = "/"
End Select。

Answer 2

你可以换个思路嘛，随机数只能显示数字，但也可以转换为符号
Dim a
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Randomize()
a = Int(Rnd() * 4) + 1
Select Case a
Case 1
TextBox1.Text = "+"
Case 2
TextBox1.Text = "-"
Case 3
TextBox1.Text = "*"
Case 4
TextBox1.Text = "/"
End Select
End Sub
懂了吧？

Answer 3

使用随机函数，当出现哪个数字，就代表哪种运算符。
好像不能直接随机出现的。

Answer 4

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim MyRandom As New Random
Dim aa As Integer = 44
Do While aa = 44 Or aa = 46 Or aa = 48
aa = MyRandom.Next(42, 48)
Loop
TextBox1.Text = Chr(aa)
End Sub