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l270ucas

Quadratic Formula

5 posts in this topic

Just trying to get a little more experience with this whole programing thing out. Im trying to make it easier to solve the quadratic equation.

msgbox = MsgBox(4,"Quadratic Formula", "Solve Equation?")

If $msgbox = 6 Then
   $a = InputBox("Quadratic Formula", "What is the value of a?")
   $b = InputBox("Quadratic Formula", "What is the value of b?")
   $c = InputBox("Quadratic Formula", "What is the value of c?")

$quadraticformula = (-$b + ($b^2-4*$a*$c)^1/2)/(2*$a)
$quadraticforumla1 = (-$b + ($b^2+4*$a*$c)^1/2)/(2*$a)



EndIf

MsgBox(0, "Quadratic Formula", "X = , , " & $quadraticformula & $quadraticforumla1)

This is what i  have so far and it runs. However When the final msg box comes up it says my value for x but then it also says #IND. Just that mean i need to tell it to round to a certain digit? Would just like a little help cleaning this up if its possible.

 

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l270ucas,

You were not correctly evaluating the formula - you needed a whole lot more parentheses to get the various calculations done in the correct order: ;)

 

$a = InputBox("Quadratic Formula", "What is the value of a?")
$b = InputBox("Quadratic Formula", "What is the value of b?")
$c = InputBox("Quadratic Formula", "What is the value of c?")

$quadraticformula = (($b * -1) + ((($b ^ 2) - (4 * $a * $c)) ^ (1 / 2))) / (2 * $a)
$quadraticformula1 = (($b * -1) - ((($b ^ 2) - (4 * $a * $c)) ^ (1 / 2))) / (2 * $a)

MsgBox(0, "Quadratic Formula", "X = " & $quadraticformula & " and " & $quadraticformula1) ; And it helps if you use the correct variable here
That runs for me - and gives the correct answers when I test. :)

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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Guys,

You also have to check that the determinant Δ = b2 - 4ac is not negative, else your solutions {x1, x2} escape from ℝ (reals) and "fall" into ℂ (complex).

Finally Δ = 0 leads to a double solution, with x1 = x2


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That does help with the right parentheses. And I wasn't sure how to display two variables in a msg box. So thanks for that!

Jchd But I'm confused about your statement of - (b^2 - 4ac)^(1/2). Because the quadratic formula uses plus or minus, but I don't know how to do that so I wrote two variables, one positive, one negative.

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#5 ·  Posted (edited)

  • Δ < 0 : no real solution

{x1, x2} = ∅

  • Δ = 0 : one (double) real solution

{x1, x2} = {-b/(2 a)}

  • Δ = 0 : two real solutions

{x1, x2} = {(-b - Sqrt(Δ)) / (2 a), (-b + Sqrt(Δ)) / (2 a)}

Edited by jchd

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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