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Download Essential AutoLISP®: With a Quick Reference Card and a by Roy Harkow PDF

By Roy Harkow

AutoCAD is the main prevalent computer-aided layout package deal on the planet. beneath AutoCAD is a robust computing language referred to as AutoLISP. This language is designed to automate many capabilities of AutoCAD. This ebook is a hands-on creation to AutoLISP and its purposes. AutoLISP is a different and strong language with a purpose to write, debug, and regulate courses tremendous speedy, when you know the way the language itself works. half I includes an easy-to-learn pictorial illustration for information and code, a device used to simply clear up difficulties in a different way approached via trial and blunder procedure. crucial AutoLISP is the single booklet in its box that makes use of the pictorial illustration. half II is dedicated to studying how AutoLISP techniques the code entered. half V not just explains the reasons of commonest errors messages and the way to resolve them, yet examines many different error that do not inevitably supply messages.

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We count with them, perform mathematical operations on them, use them to represent colors, and convert them to strings in order to place them in our drawings. Those of us who have programmed in other computer languages will find that numbers behave in a familiar manner. There are two types of numbers in AutoLISP: integers and reals. 02562e4 Figure 1-2 Integers Integers are the counting numbers, such as 0, 1, 2, 3, -1, and -25. Within AutoLISP, the largest integer is 231 - 1. However, when numbers are passed between AutoLISP and AutoCAD, the largest integer is 2 15- 1• Thus our practical range for integers is -32768 to 32767, the maximum that can be expressed in a 16-bit word.

You'll find the explanations more revealing if you type in these examples at the Command: prompt. As you do, keep the following in mind: AutoLISP is reloaded every time we open a new drawing, and nothing we do in AutoLISP can 7 Part I Working with AutoLISP Data irreparably harm our drawing, AutoCAD, or AutoLISP itself. Therefore, never hesitate to try something new. 2 Why AutoLISP? There are many different computer languages. Why did Autodesk decide to implement a version of Lisp rather than C, BASIC, FORTRAN, or one of the others?

A third place where we use strings is in AutoCAD commands. When we call an AutoCAD command from within Auto LISP, we often supply the data that the command needs as strings. We can make a string be a value of a symbol with setq: Command: ( setq part "Part N. 3 2 . A 0 However, strings cannot themselves be used to build relationships. In other words, a string can have many arrows coming in, but it can't have any arrows going out. Since strings can't be used to build relationships, they aren't very interesting from a programmer's standpoint.

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