laurin cbm basic, cbmbasic, basic 2.0, c64

lauri@debian:~$ cd cbmbasic/
lauri@debian:~/cbmbasic$ ls
cbmbasic-master  cbmbasic-master.zip
lauri@debian:~/cbmbasic$ cd cbmbasic-master/
lauri@debian:~/cbmbasic/cbmbasic-master$ ls
BAS         cbmbasic.vcproj  Makefile        plugin.o   runtime.o
basic.bas   console.c        Makefile.sun32  readdir.c  stat.h
cbmbasic    console.h        Makefile.win32  readdir.h  test
cbmbasic.c  console.o        plugin.c        README.md
cbmbasic.o  glue.h           plugin.h        runtime.c
lauri@debian:~/cbmbasic/cbmbasic-master$ ls BAS/*.bas
BAS/basic.bas
lauri@debian:~/cbmbasic/cbmbasic-master$ cat BAS/*.bas
10 DEF FN DBL(X) = X + X
20 PRINT FN DBL(2)
lauri@debian:~/cbmbasic/cbmbasic-master$ ./cbmbasic

    **** COMMODORE 64 BASIC V2 ****

 64K RAM SYSTEM  38911 BASIC BYTES FREE

READY.
10 DEF FN DBL(X) = X + X
20 PRINT FN DBL(2)
RUN
 4

READY.
20 PRINT FN DBL(20)
RUN
 40

READY.
20 PRINT FN DBL(-2)
RUN
-4

READY.
20 PRINT FN DBL(-20)
RUN
-40

READY.
PRINT FN DBL(-3)
-6

READY.
PRINT FN DBL(-1.25)
-2.5

READY.
PRINT FN DBL(-0.3333333333)
-.666666667

READY.