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Statements.md

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title Statements
parent Reference Section
nav_order 2
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permalink /Reference/Statements

Statements

These statements are built into the language itself. They are understood by the compiler, and are not explicitly declared nor defined in the visible runtime library.

Alphabetical List

  • Alias -- (twinBASIC) declares an alternative name for an intrinsic type, user-defined type, or interface

  • Call -- transfer control to a procedure

  • Class -- define a class

  • CoClass -- (twinBASIC) defines a creatable COM class as the contract for one or more Interface blocks

  • Close -- concludes input/output (I/O) to a file opened using the Open statement

  • Const -- declares constants for use in place of literal values

  • Continue -- immediately begins the next iteration of the enclosing loop

  • Declare -- declares references to external procedures in a dynamic-link library (DLL)

  • Delegate -- (twinBASIC) declares a function-pointer type --- a named signature for indirect calls

  • Dim -- declares variables and allocates storage space

  • Do ... Loop -- repeats a block of statements while a condition is True or until a condition becomes True

  • End -- ends a procedure or block

  • Enum -- declares a type for an enumeration

  • Erase -- reinitializes the elements of fixed-size arrays, or releases dynamic-array storage space

  • Error -- simulates the occurrence of an error

  • Event -- declares a user-defined event

  • Exit -- exits a block of Do…Loop, For…Next, Function, Sub, or Property code

  • For ... Next -- repeats a group of statements while the loop counter approaches its final value

  • For Each...Next -- repeats a group of statements for each element in an array or collection

  • Function -- declares the name, arguments, and code that form the body of a Function procedure

  • Get -- reads data from an open disk file into a variable

  • GoSub ... Return -- branches to and returns from a subroutine within a procedure

  • GoTo -- branches unconditionally to a specified line within a procedure

  • Handles -- (twinBASIC) binds a procedure as an event handler for one or more named events

  • If ... Then ... Else -- conditionally executes a group of statements, depending on the value of an expression

  • Input # -- reads data from an open sequential file and assigns it to variables

  • Implements -- specifies an interface or class that will be implemented in the class in which it appears

  • Interface -- (twinBASIC) defines a COM interface using twinBASIC syntax

  • Kill -- deletes files from a disk

  • Let -- assigns the value of an expression to a variable or property

  • Line Input # -- reads a single line from an open sequential file into a string variable

  • Load -- loads an object (typically a form) into memory without showing it

  • Lock, Unlock -- control access by other processes to all or part of an open file

  • LSet -- left-aligns a string within a string variable, or copies one user-defined-type variable into another

  • Mid = -- replaces a specified number of characters within a string variable

  • MidB = -- byte-positioned form of Mid =

  • Module -- defines a module: a non-instantiable container for procedures, constants, types, and module-level variables

  • Name -- renames a disk file, directory, or folder

  • New -- creates a new instance of a class

  • On Error -- enables an error-handling routine and specifies its location, or disables error handling

  • On ... GoTo, On ... GoSub -- branch to one of several lines based on the value of an expression

  • Open -- enables input/output (I/O) to a file

  • Option -- configure a compiler option

  • ParamArray -- declares the final parameter of a procedure as an arbitrary-arity list of arguments

  • Print # -- writes display-formatted data to a sequential file

  • Private -- declares module-level variables accessible only within the declaring module

  • Property -- declares the Get, Let, or Set procedures that form the body of a property

  • Protected -- (twinBASIC) declares a class member accessible within the class and its derived classes

  • Public -- declares module-level variables accessible to all procedures in all modules

  • Put -- writes data from a variable to a disk file

  • RaiseEvent -- fires an event declared at the module level within a class, form, or document

  • Randomize -- initializes the random-number generator

  • ReDim -- reallocates storage space for a dynamic array

  • Resume -- resumes execution after an error-handling routine is finished

  • Return -- returns from a GoSub subroutine, or (twinBASIC) exits a procedure with an optional value

  • RSet -- right-aligns a string within a string variable

  • SavePicture -- saves a graphic from a Picture or Image to a file

  • Seek -- sets the read/write position within a file opened by using the Open statement

  • Select Case -- executes one of several groups of statements, depending on the value of an expression

  • Set -- assigns an object reference to a variable or property

  • Static -- declares procedure-local variables whose values are preserved between calls

  • Stop -- suspends execution

  • Sub -- declares the name, arguments, and code that form the body of a Sub procedure

  • Type -- defines a user-defined data type containing one or more elements

  • Unload -- removes an object (typically a form) from memory

  • While ... Wend -- executes a series of statements as long as a given condition is True

  • With -- executes a series of statements on a single object or a user-defined type

  • Write # -- writes raw, delimited data to a sequential file (paired with Input #)

  • #If ... Then ... Else, #Const -- compiler directives that conditionally include code blocks at compile time

Deprecated

  • DefBool through DefVar -- set the default data type for variables whose names start with given letters; superseded by explicit As type declarations