tailieunhanh - J For C Programmers

In C++11 for Programmers , the Deitels bring their proven Live Code approach to teaching today’s powerful new version of the C++ language. Like all Deitel Developer titles, they teach the best way possible: via hundreds of complete example C++ programs, with thousands of lines of downloadable C++ source code. | J For C Programmers Henry Rich 2002 04 11 Copyright 2002 Henry H. Rich. All rights reserved. Send comments to glasss@ Foreword You are an experienced C programmer who has heard about J and you think you d like to see what it s all about. Congratulations You have made a decision that will change your programming life if only you see it through. The purpose of this book is to help you do that. It won t be easy and it certainly won t be what you re expecting. You ve learned languages before and you know the drill find out how variables are declared learn the syntax for conditionals and loops learn how to call a function get a couple of examples to edit and you re a coder. Fuggeddaboutit In J there are no declarations seldom will you see a loop and conditionals often go incognito. As for coding from examples well most of our examples are only a couple of lines of code you won t get much momentum from that You re just going to have to grit your teeth and learn a completely new way to write programs. Why should you bother To begin with for the productivity. J programs are usually a fifth to a tenth as long as corresponding C programs and along with that economy of expression comes coding speed. Next for the programming environment J is an interpreted language so your programs will never crash you can modify code while it s running you don t have to deal with makefiles and linking and you can test your code simply by entering it at the keyboard and seeing what it does. If you stick with it J won t just help the way you code it ll help the way you think. C is a computer language it lets you control the things the computer does. J is a language of computation it lets you describe what needs to be done without getting bogged down in details but in those details the efficiency of its algorithms is extraordinary . Because J expressions deal with large blocks of data you will stop thinking of individual numbers and start thinking at a larger scale. Confronted with

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