# Expressions

This section explains how to write expressions in the Analytica language, such as

`(-B + Sqrt(B^2 - 4*A*B))/(2*A)`

You use expressions in the Definition of a Variable or Function to say how to calculate. An expression can be simply a literal number, including Boolean or date, a text value, or an identifier of a variable. Or it could be an arithmetic expression, a comparison or logical expression, IF a THEN b ELSE c, or a function call, such as `Sqrt(B)`

.

Analytica is primarily a Declarative language, where the Definition of each variable is a simple expressions. But Analytica does support constructs used in common procedural or imperative languages like Python or C++, including `BEGIN ... END `

statements, For and While loops, local variables, assignments, references and data Structures, and handles to objects. See Procedural Programming for details.

## Sections

- Numbers
- Date and Time Values
- Boolean or truth values
- Text values
- Operators
- IF a THEN b ELSE c
- Function calls and parameters
- Math functions
- Numbers and text
- INF, NAN, and NULL - Exception values
- Warnings
- Datatype functions

## See Also

- Expression Syntax
- Parsed Expressions
- Expression Assist
- The Expression popup menu
- Tutorial: Using local variables and indexes in an expression

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