CLEAR command

[TerryRitchie]

Hi, I need an explanation about the command "CLEAR".

DIM a% locates a part of memory for the variable a%, that is empty.

a%=1 give to the variable a% the value 1.

What does CLEAR? Does it makes a% empty again, or does it deletes the memory located for a%, virtually "deleting" the command DIM a%?

CLEAR erases the values within variables. The variables still exist they are just nulled or set to zero.

Dynamic arrays (REDIM) are completely removed however and will need to be redimensioned after a CLEAR statement. The code below shows the different behaviors.

Code: (Select All)

OPTION _EXPLICIT

DIM a%
DIM s$

REDIM b%(20)

a% = 1
s$ = "Test"
b%(20) = 2
PRINT a%
PRINT s$
PRINT b%(20)
CLEAR
PRINT a% ' a reset to 0
PRINT s$ ' reset to null
'PRINT b%(20) ' if you activate this line you'll get an error