PRINT FNbinary(5)
PRINT FNbinary(50)
PRINT FNbinary(9000)
END

DEF FNbinary(N%)
LOCAL A$
REPEAT
  A$ = STR$(N% AND 1) + A$
  N% = N% >>> 1  : REM BBC Basic prior to V5 can use N% = N% DIV 2
UNTIL N% = 0
=A$