Small Basic: Resolver ecuaciones cuadráticas (código)

De la biblioteca Program Listing:   http://smallbasic.com/program/?CXK936

TextWindow.Title="Quadratic Equation Solver© - Brought to you by Sam Christy"
TextWindow.ForegroundColor="Green" TextWindow.WriteLine("ax² + bx + c = 0") start: TextWindow.WriteLine("") TextWindow.Write("a: ") a=TextWindow.ReadNumber() If a = 0 Then   TextWindow.WriteLine("")   TextWindow.WriteLine("ERROR: Equation invalid, a = "+a+", a cannot = 0.")   TextWindow.WriteLine("Please try again...")   TextWindow.PauseWithoutMessage()   Goto start
EndIf TextWindow.Write("b: ") b=TextWindow.ReadNumber() TextWindow.Write("c: ") c=TextWindow.ReadNumber() TextWindow.WriteLine("") TextWindow.WriteLine("Equation: "+a+"x² + "+b+"x + "+c+" = 0") TextWindow.WriteLine("") delta=Math.Power(b,2)-4*a*c
If delta < 0 Then   TextWindow.WriteLine("ERROR: Equation invalid, Delta (b² - 4ac) = "+delta+", Delta cannot be less than 0.")   TextWindow.WriteLine("Please try again...")   TextWindow.PauseWithoutMessage()   Goto start
Else         If delta = 0 Then                  solution1 =(-b+Math.SquareRoot(Math.Power(b,2)-4*a*c))/(2*a)                  TextWindow.WriteLine("x: " + solution1)         Else                  solution1 =(-b+Math.SquareRoot(Math.Power(b,2)-4*a*c))/(2*a)                  solution2 =(-b-Math.SquareRoot(Math.Power(b,2)-4*a*C))/(2*a)                  TextWindow.WriteLine("x: " + solution1)                  TextWindow.WriteLine("x: " + solution2)         EndIf EndIf TextWindow.WriteLine("") TextWindow.WriteLine("Would you like to perform another calculation? (Y or N)") answer=TextWindow.Read() If answer = "Y" Or answer = "y" Then   Goto start
Else   TextWindow.Clear()   TextWindow.WriteLine("I hope you have enjoyed using my program!")   TextWindow.WriteLine("©Copyright Sam Christy 2010")   TextWindow.WriteLine("")   TextWindow.WriteLine("Simply press any key to exit...")   TextWindow.PauseWithoutMessage()
  Program.End() EndIf