Алгоритмические трюки для программистов

"This is the first book that promises to tell the deep, dark secrets of computer arithmetic, and it delivers in spades. It contains every trick I knew plus many, many more. A godsend for library developers, compiler writers, and lovers of elegant hacks, it deserves a spot on your shelf right next to Knuth."

—Josh Bloch

"When I first saw the title, I figured that the book must be either a cookbook for breaking into computers (unlikely) or some sort of compendium of little programming tricks. It's the latter, but it's thorough, almost encyclopedic, in its coverage."

—Guy Steele

These are the timesaving techniques relished by computer hackers—those devoted and persistent code developers who seek elegant and efficient ways to build better software. The truth is that much of the computer programmer's job involves a healthy mix of arithmetic and logic. In Hacker's Delight, veteran programmer Hank Warren shares the tricks he has collected from his considerable experience in the worlds of application and system programming. Most of these techniques are eminently practical, but a few are included just because they are interesting and unexpected. The resulting work is an irresistible collection that will help even the most seasoned programmers better their craft.

Topics covered include:

• A broad collection of useful programming tricks
• Small algorithms for common tasks
• Power-of-2 boundaries and bounds checking
• Rearranging bits and bytes
• Integer division and division by constants
• Some elementary functions on integers
• Gray code
• Hilbert's space-filling curve
• And even formulas for prime numbers!

This book is for anyone who wants to create efficient code. Hacker's Delight will help you learn to program at a higher level—well beyond what is generally taught in schools and training courses—and will advance you substantially further than is possible through ordinary self-study alone.

Booknews

A computer scientist deeply embedded in IBM has compiled small programming tricks he has come across over his four decades in the field. Most work only on computers that represent integers in two's- complement form, and are easily adapted to machines with various register sizes, though a 32-bit machine is assumed when the register length is relevant. He gives proofs only when the algorithm is not obvious, and not always then. Annotation c. Book News, Inc., Portland, OR

"This is a collection of small programming tricks that I have come across over many years. Most of them will work only on computers that represent integers in two's-complement form. Although a 32-bit machine is assumed when register length is relevant, most of the tricks are easily adapted to machines with other register sizes." "This book does not deal with large tricks such as sophisticated sorting and compiler optimization techniques. Rather, it deals with small tricks that usually involve individual computer words or instructions, such as counting the number of 1-bits in a word. Such tricks often use a mixture of arithmetic and logical instructions." -- From the preface. Introduction Basics Power-of-2 Boundaries Arithmetic Bounds Counting Bits Searching Words Rearranging Bits and Bytes Multiplication Integer Division Integer Division by Constants Some Elementary Functions Unusual Bases for Number Systems Gray Code Hilbert's Curve Floating Point Formulas for Primes Arithmetic Tables for a 4-Bit Machine Newton's Method None None "This book is for anyone who wants to create efficient code. Hacker's Delight will help you learn to program at a higher level - well beyond what is generally taught in schools and training courses - and will advance you substantially further than is possible through ordinary self-study alone."--Jacket.