Release Notes

Version 0.3

Extended numbers to also handle reals (floating point):

• Additional primitive functions added include: 'real?'
• Extended basic math functions primitives ('+', '-', '*', 'quotient', and 'remainder') to support real numbers in addition to integers.
• IEEE 755 double precision floating point was implemented.
• Floating point numbers will automatically be converted back to integers if the floating point remainder is exactly zero.
• Math functions shift to floating point if any floating point number is present in the string of multiple arguments.

Version 0.2

Added basic file I/O support:

• Additional primitive functions added include: 'load', 'open-input-port', 'close-input-port', 'eof-object?', 'open-output-port', 'close-output-port', 'input-port?', 'close-port?', 'peek-char', 'read-char', 'write-char', 'read', 'write', and 'error'.

Version 0.1

A first cut at basic REPL functionality is complete. Provided functionality includes:

• No garbage collection -- you will eventually run the heap dry
• No file system -- you cannot yet save your work or load Scheme files
• Poor error handling -- sometimes the REPL knows how to recover, sometimes it doesn't
• Since no file system, no standard library -- what follows is what you've got to work with
• Primitive types supported include:
  • boolean (examples: #t, #f)
  • character (examples: #'x', #'\n')
  • integer (examples: 1, 004, 78, -4)
  • string (examples: "hello world")
• All embedded C-style escape characters are supported (examples: \a, \n, \t)
• Primitive symbols currently supported include: 'quote', 'define', 'set', 'if', 'lambda', 'begin', 'cond', 'else', 'let', 'and', and 'or'.
• Primitive functions currently supported include: 'null?', 'boolean?', 'symbol?', 'integer?', 'char?', 'string?', 'pair?', 'procedure?', 'char->integer', 'integer->char', 'number->string', 'string->number', 'symbol->string', 'string->symbol', '+', '-', '*', 'quotient', 'remainder', '=', '<', '>', 'cons', 'car', 'cdr', 'set-car!', 'set-cdr!', 'list', 'eq?', 'apply', 'interaction-environment', 'null-environment', 'environment', 'eval', and 'exit'.