  ## Cal Pad Folio - Help & FAQs

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

Cal Pad Folio+ is an in-app upgrade priced at 0.99 USD or equivalent in local currency. The upgrade removes advertisements and offers more than 40 math functions in addition to the basic ones highlighted below. You can find more help on how to use these functions in this page.

abs()
acos()
acosh()
acotan()
acotanh()
acsc()
acsch()
asec()
asech()
asin()
asinh()
atan()
atanh()
avg(,,)
ceil()
cos()
cosh()
cotan()
cotanh()
count(,,)
covercosin()
coversin()
crd()
csc()
csch()
dtor()
e
excsc()
exp()
exsec()
factorial()
floor()
hacovercosin()
hacoversin()
haversin()
havercosin()
ln()
log()
log2()
max(,,)
median(,,)
min(,,)
mod(,)
nthroot(,)
percent()
phi
pi
pow(,)
random(,)
rtod()
sec()
sech()
sinh()
sin()
sqrt()
stddev(,,)
tanh()
tan()
vercosin()
versin()

### 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

### 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

### 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

### 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. You can turn off the ?! in the settings. 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

### 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

### How do I manage files?

You can start a new file by pressing the plus button in the Folio. You can left swipe an existing file and delete it in the Folio as well.

### How do I share the notes?

Use the action and 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.

### How do I contact support?

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