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Random maths symbol into textbox

Posted on 2003-12-02
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Last Modified: 2008-03-04
How can i make a random maths symbol, plus, minus, divide, multiply appear into a text box at the click of a button.
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Question by:s1555
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5 Comments
 

Expert Comment

by:Vrenox
ID: 9858827
Not the best way maybe but the easiest I could think of.. put the math symbols in a hashtable paired with a number from 0 to 3 like so:

Private myHashTable As New HashTable
myHashTable.Add(0, "+")
        myHashTable.Add(1, "-")
        myHashTable.Add(2, "*")
        myHashTable.Add(3, "/")

then in the buttonclick handler all you have to do is the following:

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim myRandomNumGen As New Random
        MathSignText.Text = ""  'Clean up old value
        MathSignText.Text = myHashTable(myRandomNumGen.Next(4))
End Sub

This should do it


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LVL 12

Accepted Solution

by:
roverm earned 250 total points
ID: 9858927
Or simply do this in the onclick event:

        Randomize()
        txtBox.Text = Mid("+-/*", Int(Rnd() * 4) + 1, 1)

D'Mzzl!
RoverM
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LVL 9

Expert Comment

by:malharone
ID: 9871724
i liked roverm's style the best !! simple and does the work.. though could be more generalized

public sub printRandomChar()
        Randomize()
        dim chars as string = "+-/*"
        txtBox.Text = Mid(chars, Int(Rnd() * chars.length) + 1, 1)
end sub


so .. now, all you'd have to do is change the value of chars, and you'd have to remember to change the max. value of string.
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LVL 96

Expert Comment

by:Bob Learned
ID: 10287349
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: roverm {http:#9858927}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

TheLearnedOne
EE Cleanup Volunteer
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