This is the command scheme48 that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
scheme48 - a Scheme interpreter
SYNOPSIS
scheme48 [-i image] [-h heapsize] [-a argument]
DESCRIPTION
scheme48 is an implementation of the Scheme programming language as described in the
Revised^5 Report on the Algorithmic Language Scheme. A runnable system requires two
parts, an executable program that implements the Scheme 48 virtual machine, and an image
that is used to initialize the store of the virtual machine. scheme48 is a shell script
that starts the virtual machine with an image that runs in a Scheme command loop.
The scheme48 command loop reads Scheme expressions, evaluates them, and prints their
results. It also executes commands, which are identified by an initial comma character.
Type the command ,help to receive a list of available commands.
The meaning of the -h option depends on the type of garbage collector that was chosen at
configuration time. If heapsize is a positive number, it specifies the number of words
that can be live at any given time. One word is four bytes. Cons cells are currently 3
words, so if you want to make sure you can allocate, say, a million cons cells, you should
specify -h 3000000 (actually a little more, to account for the initial heap image and
breathing room).
If you specify a maximum smaller than the memory needed to load the image file, the
maximum is increased accordingly and a message is written to the console.
For the BIBOP garbage collector, heapsize may be 0. This means the heap will possibly
keep growing until your system runs out of memory. Because of this risk, a warning message
is written to the console if you specify -h 0.
The ,dump and ,build commands put heap images in files. The -i option causes the initial
heap image to be taken from file image. The -a option causes a list of strings to be
passed as the argument to an image generated using the ,build command. The first argument
to ,build is a procedure that is passed the arguments following -a and which should return
an integer (which is the return value of the Scheme 48 process).
> ,build (lambda (a) (display a) (newline) 0) foo.image
> ,exit
$ scheme48 -i foo.image -a mumble
mumble
$
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