REM String variables are initially empty after declaring them.

PROC main:
  LOCAL s$(10)
  checkstr:(s$)
  s$="not empty."
  checkstr:(s$)
  s$=""
  checkstr:(s$)
  GET
ENDP

PROC checkstr:(s$)
  IF s$=""
    PRINT "String is empty."
  ELSE
    PRINT "String is",s$
  ENDIF
ENDP