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