Download The AutoCADET's Guide to Visual LISP by Bill Kramer PDF

By Bill Kramer

ISBN-10: 0080493955

ISBN-13: 9780080493954

ISBN-10: 157820089X

ISBN-13: 9781578200894

AutoCADet: anyone who makes use of AutoCAD without delay or not directly to create or study photo photos and is in ownership of 1 or extra of the subsequent qualities: desires to research; has an curiosity in bettering the best way AutoCAD works; is a visionary AutoCAD consumer; i customise AutoCAD to incorporate productiveness improvements like new instructions, mixtures of current instructions or checklist processing scripts to shop and manage facts. This educational deals an entire creation to the visible LISP language, setting and editor. complex subject matters contain facts manipulation and programming conversation packing containers.

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Extra info for The AutoCADET's Guide to Visual LISP

Sample text

If the message does not indicate a cancel, the INPUTNAME variable is saved in the USER_USERNAME global variable in line 5. The INPUTNAME variable is assumed to exist as part of the fictional application.

You can use any number of physical lines of code to represent a logical line. Physical lines end with a carriage return (the Enter key). Logical lines end with the balancing parenthesis to the open parenthesis at the start of the logical line. The logical line of code (+ 1 2) could be entered over four physical lines, as in the following. (+ 1 2 ) You can add a comment to any physical line of code by entering text between a semicolon (;) and the end of the physical line. All text after the semicolon is considered a comment and is ignored by the evaluator when it runs.

The A symbol has been set to a value of 1 in a previous expression. That value is tucked away and the evaluator continues by getting the value in B, which is 10. The result, 11, is stored using the C symbol reference. SETQ expressions that appear in a sequence one after another can be combined into a single expression. This results in slightly faster execution because the evaluator does not have to work with each individual expression. It also results in less typing when defining an expression or a complex series of expressions.

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