robison.hin

来自「1984-1993模糊 C 源代码竞赛.zip 非常的好,不过这是DOS格式,」· HIN 代码 · 共 46 行

Best minimal use of C: <[e-mail]> Arch D. Robison

	Arch D. Robison
	University of Illinois
	1304 W. Springfield Ave.
	Urbana, IL 
	61801
	USA

Judges notes:

	Sites with punch card facilities will be happy to note that
	the source deck can be re-collated with an ASCII sort.

	Note that this program uses only a small subset of the
	constructs that the C language supports.

Selected notes from the author:

	This program is a handy picoAPL interpreter written in C--.  It
	outputs the evaluation of an APL expression from standard
	input.  Functions are limited to dyadic +,-,x, and unary -;
	numerals must be binary.  Parentheses may be used for
	grouping.  For example:

		101x111-100

	prints:

		1111

	That is 5x(7-4) is 15.  (APL groups from right to left.)
	Extending it to the full APL language should be trivial.

	The C-- language improves the C language by removing superfluous
	and confusing features: arithmetic, logical operations, shifts,
	relationals, address-of, and flow control.  In fact, the only 
	expressions retained are function calls, indirection, array 
	assignments, the ',' operator, and sizeof.  Despite these
	restrictions, the C-- program does arithmetic on arbitrarily 
	large binary numbers.

	To obtain a C-- reference, simply rip out the irrelevant pages 
	from your K&R C manual.  To obtain a C-- compiler, simply rip
	out the irrelevant bytes from your cc compiler.