The Support area hosts a number of **use cases** and **frequently asked questions**. The general sections focus on the iOS version, the bottom section outlines the differences and keyboard shortcuts in the Mac version. If you have a question about Inseries, or if you encounter a problem we encourage you to take a look at the FAQ first. Still got questions or ideas for improvements? Contact us :-)

Adding Sales Tax or VAT is easier with Inseries than with most other calculators. Simply type in the price and then add the tax by adding the actual percentage (e.g. 20% for Austria's VAT). Inseries will intuitively guess that you really want to add the percentage rather than the number 0.2 ;-). A tip: you probably also want to switch to two fraction digits mode by double tapping on the result field.

Sometimes you need to sum up many numbers and you want to keep track on what you already entered. The best way to do this with Inseries is by entering each number followed by the quick-sum key on the calculator keypad. The `quick-sum` key always adds the entered number to the current result, so you save a key press and you see all summed up numbers nicely on top of each other. A tip: clear the result before starting such a calculation, this will add a stronger separator line below the previous result.

The easiest way is to use the `%` modulo operator (e.g., 5 % 2). Alternatively, we also supply a `mod` function. Access the function chooser via the `f` function key on the left bottom of the calculator keypad. Then select the `mod` function in the "General" section. Enter the dividend argument first, then press the argument separator key on the keypad (comma ',' or semicolon ';' depending on your locale settings), finally add the divisor as the second argument.

Also subtracting discounts is very easy with Inseries. Like for adding taxes, you can also deduct discounts simply by subtracting the actual percent discount (e.g., "-30%"). Inseries will then assume that you want to subtract 30% of the left operand value. Again you may want to switch two fraction digits mode by double tapping on the result field.

All trigonometric functions such as sine, cosine, and tangent are located in the functions chooser that you access via the `f` function key on the left bottom of the calculator keypad (section "Trigonometric"). You simply choose the function and then enter the function's argument (within the brackets). Please note that currently only radians are supported, e.g., the period of sine is 2*pi. You can convert degrees to radians by multiplying them with `pi/180`. Tip: You can omit the closing bracket after an argument at the end of a calculation (Inseries will auto-complete it correctly).

Humans are inherently bad at coming up with random numbers (actually, computers, too, but you can trick them to come up with slightly better results ;-), therefore a random number generator can sometimes come in handy. Inseries contains a "real" random number generator that is better than most typical built-in `rand` functions. As it is a function, you find the `rand` function in the functions chooser. The `rand` function does not take any arguments and returns a random decimal number between 0 and 1. In order to calculate a random integer number, say between 0 and 9 we can multiply the rand result with 10 and "round" it down to the next integer value using the `floor` function (e.g., floor(3.2) and floor(3.9) both result 3).

If you start a new calculation with an operator you are implicitly using the current result as the left operand. In order to use the result in the middle of a calculation, or as an operand for a function you can use the `R` button on the calculator keypad.

Yes, long-tapping the `backspace key` (located in the top-left corner of the calculator keypad) will clear the calculation field.

Long-tap on the result field to bring up the result field menu. Select the `Copy Result` action to copy the result into the clipboard.

Yes, you can use the `undo-button` in the top-left corner of the calculator pad to go back one result.

The easiest way to clear the result field is to use a swipe-right gesture on the right-hand side of the result field. Alternatively, you can long-tap on the result field to bring up the result field menu and use the `Clear Result` action.

Yes, long-tap on the result field to bring up the result field menu and use the `Clear All Results` action to clear all previous results.

You can enter dates using one of two formats: DD.MM.YYYY, or MM.DD.YYYY (or DD,MM,YYYY if the ',' is your decimal separator). You can switch between both formats using the result field context menu. You can also enter two-digit years (YY) where years 70 or higher are interpreted as 1970, 1971, etc. and lower years as 2001, 2002, 2003,...

Yes, simply use the `today` function.

You can subtract the two dates from each other (e.g., 2.11.2014 - 2.6.2014). You can also use the `ddays` function and pass the start and end date as its arguments, e.g., ddays(2.6.2014, 2.11.2014).

Yes, simply use the standard `+` operator to add days to a date (e.g., 2.6.2014 + 5). Alternatively. you can use the `adays` function: pass the start date as the first argument and the number of days as the second argument, e.g., adays(2.6.2014, 5), or adays(today(), 5).

Yes, you can use the `cweek` function to calculate the calendar week, e.g., cweek(2.6.2014).

Use a swipe-left gesture to "slide" the result into the memory on the left side of the result field. The memory icon will become darker when a value has been stored in memory.

Use a swipe-right gesture on the *left* side of the result field to "push" the memory variable into the calculation field ("M"). Alternatively, you can use the `M` button on the calculator keypad (2nd on `R`).

Use a swipe-up gesture on the left side of the result field to clear the memory. The memory icon will get lighter again when the memory has been cleared.

You can always access the overlay help view that is shown on first startup by swiping your finger up from the bottom of the calculator keypad.

Inseries provides three different fraction digit modes: All fraction digits (default), 2 fraction digits, and 4 fraction digits. You toggle between fraction digit modes via double-tapping onto the result field. You know that you are in 2 fraction digit mode if a small `2` is shown to the right of the result field; the 4 fraction digit mode shows a small `4`. The fraction digit mode is an implicit app setting and, thus, persists between app restarts.

You can access all functions via the "f" function key on the left bottom of the calculator keypad. Most functions take a single argument right after the opening bracket (e.g. `sin`, `cos`, `tan`, `round`). The modulo function `mod` takes two arguments that need to be separated by the argument separator key (comma ',' or semicolon ';' depending on your locale settings). The random value function `rand` takes no arguments.

You can access all built-in constants via the 2nd function (`c`) of the `f` function key in the lower left area of the calculator keypad. The most often used constants `pi` and `e` are accessible directly via the key right above the function key. All other mathematical constants are accessible via the function chooser only. If you want to "see" the decimal number behind a constant simply add it to an empty calculation and press the enter key on the calculator keypad.

The default global hotkey for activating Inseries is `CTRL+CMD+0`; you can configure the global hotkey using the preferences window accessible via the gear drop-down menu. In order to close Inseries without quitting it simply press the `ESC` key.

Yes, you can switch on auto-startup in the preferences window that is accessible through the gear drop-down menu.

Of course, simply use the gear drop-down menu to open the preferences window and switch to the black-and-white menu bar icon.

Use `CMD+S` to store the current result in memory. Either use `CMD+R` to access the memory, or simply use the `M` or `m` variable.

Use `CMD+DELETE` to delete the current result. Press `CMD+B` to go back to the previous result. You can also delete all results by using the `SHIFT+CMD+DELETE` shortcut (this functionality is also accessible via the gear drop-down menu).

If you know the name of the constant or function simply type it in (the names are case insensitive for easier usage), e.g., simply type `pi` or `PI`. Alternatively you can press `SHIFT+CMD+F` to access the function chooser context menu, or `SHIFT+CMD+C` to access the constant chooser menu.

Sure, simply use `CMD+2`, `CMD+4`, `CMD+9`, or `CMD+0` for 2, 4, all, or no fraction digits respectively.