QBasic 1.1: COMMON Statement

Explanation

COMMON Statement

Defines global variables that can be shared throughout a program or between chained programs.

Worth knowing

Useful and cross-version information about the programming environments of QBasic, QuickBasic and Visual Basic for DOS.

ASCII Code Tables
Keyboard Scan Codes
Syntax Conventions
Screen Modes
Color Attributes
Error Codes

You are here: References Overview > QBasic 1.1 Commands List > COMMON Statement

Syntax

COMMON [SHARED] variablelist

Description / Parameter(s)

SHARED

Indicates that variables are shared with all SUB or FUNCTION procedures.

variablelist

One or more variables to be shared:

variable[( )] [AS type] [, variable[( )] [AS type]]...
variable	A Basic variable name. Variable names can consist of up to 40 characters and must begin with a letter. Valid characters are A-Z, 0-9, and period (.).
type	The data type of the variable (INTEGER, LONG, SINGLE, DOUBLE, STRING, or a user-defined data type).

Unless it has been declared as a static array in a preceding DIM statement, an array variable in a COMMON statement is a dynamic array. Its dimensions must be set in a later DIM or REDIM statement.