Remote-processing CAMBASIC Manuel d'utilisateur télécharger pdf (Page 49)

Commands - 16

CLEAR

Statement

SYNTAX: CLEAR [string space]

PURPOSE: To set all numeric variables to zero, set all string variables to null, restore the data pointer, and

negate all DIM statements. You can optionally set the string space size.

REMARK S: If the optional parameter string space is specified, variables are cleared and the string space is made

equal to the number of bytes specified. 100 bytes is the default value on power– up. You can figure

the amount of string spa ce by adding up the number of ch aracter s you expect each string variable to

use and add the length of the longest string you will use. Then add 10% to that total. For example,

if you expect A$ to hold 75 characters and B$ to hold 45, you would need (45 + 75 + 75) x 1.1 =

215. For safety, you should round up to the next 100.

NOTE: Make sure you execute CLEA R befor e you execute any DIM statem ent.

Execute this statement if your program uses a large number of string variables for storage or

manipulation. You will get a <Out of string space> error if there is not enough space set

aside.

RELATED: none

EXAMPLE: The following clear s all variables and sets the string space to 100 bytes:

10 CLEAR

The following clear s all variables and reser ves 500 bytes of RAM for strings:

10 CLEAR 500

ERROR: < Data negative> – for string

< Out of memory> – if an attempt is made to clear more m emor y than is available

< Out of string space> -when not enough string space is reserved.

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Remote-processing CAMBASIC Manuel d'utilisateur Page 49