# Dice Roller / Math Formula Processing

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 Submitted on: 12/26/2018 4:28:17 PM By: Mark Kintigh Level: Intermediate User Rating: Unrated Compatibility: VB.NET Views: 898

This class is designed to calculate basic math functions (*, /, +, -), stored within a string, with a new symbol for adding a random value (simulating rolling dice). It is smart enough to also handle parenthetical formulas. I also built in C like conditions to be added to the end of the formula to skew the final result (valid conditions: >, <, =, !=, >=, <=). Has formula error handling. Almost every step of the process is heavily documented; great for beginner as well as intermediate programmers.

Here's some examples of formulas that it can process and what they mean:
• 3d6+2 -- roll 3, 6-sided dice and add 2 to the results.
• 3d6?>16:+1d6 -- roll 3, 6-sided dice and if the result is greater than 16 add an additional roll from a 6-sided die.
• (1d4)d6 -- roll a 4-sided dice and then roll that many 6-sided dice for the result.

Example usage for the code (included in the header of the class):
Public Sub TestDice()
Dim c As New clsDice
Dim r As String = "(n/a)"
Dim s As String = "help"
'
While s.Length > 0
s = InputBox("Last result: " & r & vbCrLf & vbCrLf & _
"Enter formula (""help"" for assistance): ", _
"Calculator", s)
If s.ToLower = "help" Then
c.Help()
ElseIf s <> "" Then
c.CalculateFormula(s)
If c.FormulaError Then
MsgBox("There was an error in your formula: " & _
vbCrLf & s, MsgBoxStyle.Exclamation, "Error")
Else
r = c.Result
End If
End If
End While
c = Nothing
End Sub

This class has been around for a long time (written back in 2008) and has never broken. It was first written for an AD&D program and designed to handle the typical formulas you would see in roll playing games. I finally need to add something to it and decided to share.

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