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CalPad - Help & FAQs

What is CalPad?

What is the difference between CalPad & CalPad+?

How do I do calculations?

Operators & Precedence

How do I add notes?

Why do I get ?! after pressing = sign?

Why do I get NaN after pressing = sign?

What math functions are supported?

Can I use the native onscreen keyboard or an external keyboard to type?

Can I use variables to solve equations?

Can I undo or redo an input or a delete action?

How do I start a new file?

How do I open a file?

Where do you save the file?

How do I share the notes?

How do I contact support?


What is CalPad?

CalPad is a calculator and a notepad combined in one app. It helps you do calculations and take notes along side. You can save them to a text file on the device or share them via email, SMS or online.

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What is the difference between CalPad & CalPad+

CalPad is an ad supported version of the CalPad+ app. CalPad doesn't offer all the math functions supported by CalPad+. To use the app without limitations please upgrade to CalPad+ at the Google Play or BlackBerry World stores.

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How do I do calculations?

You enter numbers and operators just like you do in a typical calculator and when you press the = sign the app automatically calculates the result and enters it after the = sign. You can use the result to do more calculations and chain more equations. You can use functions as part of your equations and even nest them within other functions.
Here are some examples:

  5.79 + 3.87 = 9.66 / 3.42 = 2.82456
  (146 - 34) * 84 = 9408
  146 - 34 * 84 = -2710 * cos(1.025) = -1406.75798
  abs(tan(6)) = 0.29101

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Operators & Precedence

Operators are evaluated in the following order: ^ * / + -. You can override this order by using () around operators with lower precedence.
Here are some examples:

  5 + 4 / 2 = 7
  (5 + 4) / 2 = 4.5

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How do I add notes?

You can type notes anywhere in the file, even right after a calculation. When starting a calculation begin a new line by pressing the enter key. If you enter notes in the same line as the calculation but before the = sign the you will get a ?! indicating an error. Starting the calculation in the next line will get you results!
Here are some examples:

  15.35 * 4 = 61.40 inches of plywood, need to confirm
  15.35 inches * 4 = ?! won't work

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Why do I get a ?! after pressing = sign?

If there is an error in the equation you will get a ?! after the = sign. You can fix the error and type the = sign again to get the result. Currently the app doesn't support letters (or variables) along with numbers in calculations. The following symbols are allowed in calculations: $ ¢ £ € ¥
Here are some examples:

  5.35 euros * 4 = ?! won't work
  $5.75 * 7 = 40.25
  850000 - ¥784253 = 65747

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Why do I get a NaN after pressing = sign?

NaN stands for 'not a number' meaning the result is undefined. For example if you try to find the square root of a negative number the app will return a NaN.
Here are some examples:

  acos(5) = NaN
  sqrt(-4) = NaN

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What math functions are supported?

Currently the following functions are supported. Click here for more details on how to use them. You can insert them using the red function key in the keypad or type them directly.

  abs( )
  cos( )
  exp( )
  log( )
  pow( , )
  sin( )
  sqrt( )
  tan( )


CalPad+ functions:

  acos( )
  asin( )
  atan( )
  atan2( , )
  cbrt( )
  ceil( )
  cosh( )
  expm1( )
  floor( )
  hypot( , )
  log10( )
  log1p( )
  max( , )
  min( , )
  random( )
  rint( )
  round( )
  signum( )
  sinh( )
  tanh( )
  toDegrees( )
  toRadians( )
  ulp( )

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Can I use the native onscreen keyboard or an external keyboard to type?

Of course! You can use any keyboard that works with your device to do calculations or take notes. The CalPad keypad is there just for convenience when you don't want to switch between numbers and letters in your onscreen keyboard. You can turn it off and get more room on your screen while using external keyboard docks especially with tablets.

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Can I use variables to solve equations?

Not yet! You can expect variables in a future release.

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Can I undo or redo an input or a delete action?

Not yet! Undo and redo shortcuts will be available in a future release.

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How do I start a new file?

Select all the text by pressing and holding the notes area and use 'Select All' in the popup menu. Then click the delete key to start over.

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How do I open a file?

You can only open and edit plain text files (usually ends with .txt). First make sure your device has a file manager software installed. You can use the open button within the app to launch the file manager and open a text file. Or launch the file manager outside the app and open a text file. Select CalPad in the 'Open with' dialog to open the file in CalPad. This app is not designed to open large files like logs.

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Where do you save the file?

Files are by default saved in /CalPad_Notes folder under the external storage directory. This could be in your internal memory or external sd card depending on your device. You can change the file path in the save dialog. It is recommended to save your work in small files for example under 2-3 letter size pages when printed.

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How do I share the notes?

Use the share button to select from one of the several options available in your device to share your notes. Depending on the software installed in your device, you could share the notes via email, sms or other online sites.

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How do I contact support?

Please send an email to appestry@gmail.com with your questions and feedback. All emails will be responded within 24 hours.

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