> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/intro/variablen.md).

# Variables

Variables contain data provided by the application for calculations and evaluations within the Formula Editor.

You use a variable by specifying its identification in the expression. The identification of the variable must not be given in quotation marks. Each variable has its own [data type](/acron-9.3/en/intro/datentypen.md). You must make sure that the data type of the variable matches the required data type.

When the Formula Editor interprets the expression, it replaces the identification of the variable with the value provided by the application for the variable. This value is then used as an argument for a function or as an operand for a logic operation.

If the identification of the variable contains blanks and/or special characters, the Formula Editor may not be able to interpret the identification of the variable. In this case you get an error message indicating that the variable was not found. To use this variable in a calculation anyway, you must use the [GetVar](/acron-9.3/en/intro/funktionen/funk_variablen.md#func_getvar) function. You give this function the identification of the variable as a [constant character](/acron-9.3/en/intro/konstanten.md) string as argument. In this way, you can also use variables whose identification contain blanks and special characters (e.g. '-', '/', '+', ...).


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