1 Running Top-Level Programs

To run a top-level program, either:

• Use the plt-r6rs executable, supplying the file that contains the program on the command line:

    plt-r6rs ⟨program-file⟩

  Additional command-line arguments are propagated as command-line arguments to the program (accessed via command-line).

  To compile the file to bytecode (to speed future runs of the program), use plt-r6rs with the --compile flag:

    plt-r6rs --compile ⟨program-file⟩

  The bytecode file is written in a "compiled" sub-directory next to ⟨program-file⟩.

  For example, if "hi.scm" contains

  (import (rnrs))

  (display "hello\n")

  then

    plt-r6rs hi.scm

  prints “hello.”

• Prefix the program with #!r6rs, which counts as a comment from the R⁶RS perspective, but is a synonym for #lang r6rs from the PLT Scheme perspective. Such files can be run like any other PLT Scheme module, such as using mzscheme:

    mzscheme ⟨program-file⟩

  or using DrScheme with the Module language. The file can also be compiled to bytecode using mzc:

    mzc ⟨program-file⟩

  For example, if "hi.ss" contains

  #!r6rs

  (import (rnrs))

  (display "hello\n")

  then

    mzscheme hi.ss

  prints “hello.” Similarly, opening "hi.ss" in DrScheme and clicking Run prints “hello” within the DrScheme interactions window.