# Expressions

This chapter introduces expressions -- the Analytica language used in definitions to calculate the value of a variable from other variables, such as

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

An expression can consist of or contain a literal number (including Boolean or date), a text value, an identifier of a variable, an arithmetic expression, a comparison or logical expression, `IF THEN ELSE`

, or a function call, such as `Sqrt(B)`

. These constructs are also introduced in this chapter.

For details on more advanced constructs, such as `BEGIN ... END `

statements, For and While loops, local variables and assignments, references and data Structures, and handles to objects, see Procedural Programming. Analytica has the expressive power to express such concepts, too, and includes a general computer language, like Visual Basic or C++.

## 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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