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CLEAR
Chapter 2 Program Instructions
Field of Application Statement clearing strings, variables and arrays in order to free memory
space.
Syntax CLEAR
Remarks The CLEAR statement empties all strings, sets all variables to zero and resets
all arrays to their default values. As a result, more free memory space
becomes available.
Example In this example, more free memory space is obtained after the strings have
been emptied by means of a CLEAR statement:
10 A$ = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
20 B$ = "abcdefghijklmnopqrstuvwxyz"
30 FOR I%=0 TO 3:FOR J%=0 TO 3:FOR K%=0 TO 20
40 C$(I%,J%)=C$(I%,J%)+A$
50 NEXT K%:NEXT J%:NEXT I%
60 PRINT "String A before: ";A$
70 PRINT "String B before: ";B$
80 PRINT "Free memory before: ";FRE(1)
90 CLEAR
100 PRINT "String A after: ";A$
110 PRINT "String B after: ";B$
120 PRINT "Free memory after: ";FRE(1)
RUN
yields:
String A before: ABCDEFGHIJKLMNOPQRSTUVWXYZ
String B before: abcdefghijklmnopqrstuvwxyz
Free memory before: 1867368
String A after:
String B after:
Free memory after: 1876200
Ok
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