Defines variables as global within a module or between chained programs.
COMMON SHARED variable_list
The SHARED keyword states that the specified variables are shared by all subprograms and functions in a module.
variable_list is the list of global variables with variable names separated by commas. QBasic allows you to specify variables as:
variable_name [ () ] [ AS type ]
COMMON statements must appear before any executable statements in your program. QBasic associates variables in common blocks by position, not by name.
COMMON a, b, c
a = 1: b = 2: c = 3
CHAIN "COMMON.BAS"
'Code for COMMON.BAS
COMMON x, y, z
PRINT x, y, z
Results in the following:
1 2 3