Object Oriented Design

Download CafeOBJ report: the language, proof techniques, and by Răzvan Diaconescu; Kokichi Futatsugi PDF

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By Răzvan Diaconescu; Kokichi Futatsugi

Lately the speculation of partly ordered teams has been utilized by analysts, algebraists, topologists and version theorists. This publication provides an important effects and themes within the thought with proofs that depend on (and interaction with) different components of arithmetic. It concludes with a listing of a few unsolved difficulties for the reader to take on. In stressing either the certain recommendations of the self-discipline and the overlap with different components of natural arithmetic, the ebook could be of curiosity to a large viewers in different parts of arithmetic easy necessities - signatures; types; sentences; pride; evidence process; structuring standards - basic semantics; techniques; module imports; perspectives; parameterized modules; module expressions; integrated modules; evidence applied sciences - rewriting; induction; coinduction; methodologies - nondeterminism; concurrent item composition; dynamic structures of items; purposes in rewriting common sense; basic small methodological advises

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Use variables whenever you want Director to remember something, such as the results of calculations, user input, lists of items, or anything that you need more than once. Programming is like cooking. You may be able to cook dinner in one pot, or you may need two frying pans and a pressure cooker; it depends on the recipe and your personal style. This example: on mouseDown if the locH of sprite (the currentSpriteNum) > 50 then put the locH of sprite (the currentSpriteNum) end if end could be rewritten as: on mouseDown set myLocH = the locH of sprite (the currentSpriteNum) if myLocH > 50 then put myLocH end if end 32 Chapter 1 – How Lingo Thinks Variables and Properties Using a “stale” value stored in a variable, instead of the current value: When you assign a variable, it records a snapshot in time.

Comment out” temporary changes or tests: gComments can exist on separate lines or at the end of a line following other Lingo commands. Anything following a comment character will be ignored until the next carriage return. Lingo does not have a way to create multiline comments, as in C, but you can use the continuation character or use more double-hyphens on subsequent lines. Example 1-17: Comments -- This is a Lingo comment on its own line set x = 1 -- This is a Lingo comment at the end of a line -- Here's a "commented out" command that is ignored -- set x = 1 -- To create a multiline comment in Lingo, -- begin each line with its own comment delimiter -- This is a multiline comment by virtue of the ¬, continuation character at the end of the previous line -- Beware!

The following examples are for illustration only and do not necessarily depict likely uses. Do Statements The do command can compile and execute a string on the fly as if it were a Lingo statement. Although it should not be used haphazardly, it can perform some interesting tricks. Most notably, you can use it to execute an arbitrary command stored in a text file or a field cast member. You can create a pseudo-Message window for debugging Projectors by do’ing the text entered in a field cast member: do "beep" do the text of field "someFieldCastMember" You cannot use do to declare global variables without a trick.

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