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# Run-Time Functions

This section describes the Runtime Functions of LibreOffice Basic.

## Basic Constants

Constants used in Basic programs

## Screen I/O Functions

This section describes the Runtime Functions used to call dialogs for the input and output of user entries.

## File I/O Functions

Use File I/O functions to create and manage user-defined (data) files.

## Date and Time Functions

Use the statements and functions described here to perform date and time calculations.

## Error-Handling Functions

Use the following statements and functions to define the way LibreOffice Basic reacts to run-time errors.

## Logical Operators

The following logical operators are supported by LibreOffice Basic.

## Mathematical Operators

The following mathematical operators are supported in LibreOffice Basic.

## எண்ம செயலாற்றிகள்

The following numeric functions perform calculations. Mathematical and Boolean operators are described in a separate section. Functions differ from operators in that functions pass arguments and return a result, instead of operators that return a result by combining two numeric expressions.

## Controlling Program Execution

The following statements control the execution of a program.

## மாறிகள்

The following statements and functions are for working with variables. You can use these functions to declare or define variables, convert variables from one type to another, or determine the variable type.

## Comparison Operators

The available comparison operators are described here.

## சரங்கள்

The following functions and statements validate and return strings.

## பிற கட்டளைகள்

This is a list of the functions and the statements that are not included in the other categories.