GWBASIC User's Manual

GW-BASIC User's Guide
CLEAR Command
Purpose:
To set all numeric variables to zero, all string variables to null, and to close all open files. Options
set the end of memory and reserve the amount of string and stack space available for use by GW-
BASIC.
Syntax:
CLEAR[,[expression1][,expression2]]
Comments:
expression1 is a memory location that, if specified, sets the maximum number of bytes
available for use by GW-BASIC.
expression2 sets aside stack space for GW-BASIC. The default is the previous stack space
size. When GW-BASIC is first executed, the stack space is set to 512 bytes, or one-eighth of the
available memory, whichever is smaller. GW-BASIC allocates string space dynamically. An
"Out of String Space" error occurs only if there is no free memory left for GW-BASIC to
use.
The CLEAR command:
● Closes all files
● Clears all COMMON and user variables
● Resets the stack and string space
● Releases all disk buffers
● Turns off any sound
● Resets sound to music foreground
● Resets PEN to off
● Resets STRIG to off
● Disables ON ERROR trapping
Examples:
CLEAR
Zeroes variables and nulls all strings.
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