> For the complete documentation index, see [llms.txt](https://viewzenlabsug.gitbook.io/userguides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://viewzenlabsug.gitbook.io/userguides/appverse/apps/create-an-app/forms/create/get-familiar/appverse-expressions/examples.md).

# Examples

Some example of calculation expressions are as under

| Required Calculation                   | Expression                                                                                                                                                                                  |
| -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| No of days to today                    | today() - ${start\_start}                                                                                                                                                                   |
| Sum of three numbers                   | ${number1} + ${number2} + ${number3}                                                                                                                                                        |
| Average of three numbers               | (${number1} + ${number2} + ${number3}) div 3                                                                                                                                                |
| First 3 characters of a string         | substr(${string}, 0, 3)                                                                                                                                                                     |
| Length of a string                     | string-length(${string})                                                                                                                                                                    |
| Weighted average of two numbers        | (${number1}\*${weight1} + ${number2}\*${weight2}) div (${weight1} + ${weight2})                                                                                                             |
| Add 30 days to a given date            | date(${my\_date} + 30)                                                                                                                                                                      |
| Maximum of two numbers                 | max(${number1}, ${number2})                                                                                                                                                                 |
| Get string 'Even' or 'Odd' of a number | if(${number} mod 2 = 0, 'Even', 'Odd')                                                                                                                                                      |
| Calculate age from date of birth       | int((today() - ${dob}) div 365.25)                                                                                                                                                          |
| Nested if                              | if(${number} < 5, 'Less than 5', if(${number} >= 5 and ${number} <= 10, 'Between 5 and 10',  if(${number} > 10 and ${number} < 25, 'Greater than 10 and less than 25', 'Greater than 25'))) |
| Check if date is Saturday or Sunday    | if(format-date(${my\_date}, '%a') = 'Sat' or format-date(${my\_date}, '%a') = 'Sun', 'Weekend', 'Weekday')                                                                                  |
| Leap year                              | if(${my\_year} mod 400 = 0 or (${my\_year} mod 4 = 0 and ${my\_year} mod 100 != 0), 'Leap Year', 'Not a Leap Year')                                                                         |
|                                        |                                                                                                                                                                                             |


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