CSCE 330 Project Algol 68 .


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CSCE 330 Project Algol 68. Joe Puzio Wael AL-Fayez Gaurav Shah Ronak Patel. History . ALGO rithmic L anguage Developed in Europe by an international group, consisting of 7 different countries, in the late 1950’s Very similar to FORTRAN
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CSCE 330 Project Algol 68 Joe Puzio Wael AL-Fayez Gaurav Shah Ronak Patel

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History ALGO rithmic L anguage Developed in Europe by a universal gathering, comprising of 7 unique nations, in the late 1950\'s Very like FORTRAN Peter Naur and J.W. Backus took a shot at the venture. Was the presentation of the BNF sentence structure. Planned particularly to programme logical calculations

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History (Continued) Never got to be as economically mainstream as FORTRAN or COBOL Was not good with IBM Is viewed as the most imperative programming dialect as far as impact on later dialect improvement Many comparative dialects can (and are) alluded to as "ALGOL-like" JAVA, C, C++, Pascal, Ada, FORTRAN, and so on

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Design Goals Design objectives: universally useful, thoroughly characterized dialect Clears up inconvenience spots in ALGOL60 (in any case, Pascal more like A60 than A68 is) orthogonality, extensibility

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Features Supports a Block Structure Two sorts of Parameter Passing Value Name Recursion Arrays Reserved Words

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Failures and Shortcomings The prime reason for the disappointment of ALGOL 68 was that an excess of was anticipated from it. It was not broadly actualized or not soon enough executed. Its formal definition was excessively perplexing, making it impossible to actualize. ALGOL 68 is known to be \'unintelligible\'. ALGOL 68 report was not legitimately wrote subsequently excessively troublesome, making it impossible to read.       ALGOL 68 semantic model was too huge with bunches of extensions  ALGOL 68 was an exceptionally numerical dialect genuinely hard to comprehend, hard to actualize. The dialect was considered to complex for now is the right time.

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Key Ideas User sort revelations (modes) Reference mode (pointers of a sort) United modes (antecedent to variation records) Auto affirmation of FOR LOOP file User-determined administrator over-burdening

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Key Ideas (Continued) Mode necessity for formals Casting: client indicated mode change Redefinition of administrator priority Semaphores W-punctuations - two-level sentence structure

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Structure ALGOL68 is piece organized w/static extension guidelines ALGOL68\'s model of calculation: static stack: square/methodology AR\'s; neighborhood information objects load: "pile" - dynamic- - information objects ALGOL68 is an expression - situated dialect

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Organization Declarations: Must be given (FOR LOOP file no one but special case) Can name new sorts (modes) Imperatives (units) 15 noteworthy unit sorts Assignment is reasonable reaction of units

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Algol 68 Modes Primitive modes Compound Modes int - exhibits Real - structures Char - techniques bool - sets string - pointers Compl(complex) bits bytes Sema (semaphore) Format (I/O) document

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Other elements of Algol 68 Storage administration • Local stockpiling on stack • Heap stockpiling, unequivocal alloc and waste gathering Parameter cruising • Pass-by - esteem • Use pointer sorts to acquire Pass-by - reference Assignable strategy factors • Follow "orthogonality " standard thoroughly Source: Tanenbaum, Computing Surveys

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Basic Syntax Addition : " + " Subtraction : " - " Multiplication : " * " Division : "/" Exponentiation : " ** " Assignment : " := " Boolean Expressions = , > , < , <= , >= ,/=

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Block Structure First dialect to execute a piece structure Similar in frame to pascal start … .. end; Each square can have its own particular factors, unmistakable just to that piece (nearby factors). After the square is left the estimations of all the nearby factors are lost.

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Block Structure illustration Example: start possess whole number i; number j,k; i := j + k; end; The whole number i will have the estimation of j+k put away whenever the square is entered By utilizing the "claim" proclamation the variable will hold its esteem for whenever the piece is entered

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Parameter Passing Two sorts of parameter going: by Value, by Name Pass by Value works the same as in most different dialects Pass by Name is like go by reference, yet it includes adaptability All parameters are go by name unless generally determined Example: can make a call "sum(i,2,5,x+6)" to the strategy entirety procedure sum(i,j,k,l); esteem i,j,k; begin i := i + j + k + l end; (will execute as i := i + 2 + 5 + (x+6))

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Recursion Algol 68 Supports recursion Example: real system factorial (n); begin if n = 1 then factorial := 1; else factorial := n* factorial(n-1); end;

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Arrays Three sorts of clusters: genuine, whole number, Boolean Each exhibit must contain all similar sorts All clusters are of sort genuine unless indicated Can have multidimensional clusters Declarations: exhibit name1[1:100]; (1D cluster of sort genuine) genuine exhibit name2(- 3:6,20:40); (2D exhibit of sort genuine) whole number exhibit name3, name4(1:46); (2 1D varieties of sort number) Boolean cluster name5(- 10:n); (1D exhibit of sort Boolean) (Allocated Dynamically )

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Algol 68 displayed the accompanying advancements (among numerous): another level in dialect portrayal with the semantics characterized to numerical accuracy and in addition the linguistic structure. A formal strategy for depicting, developing and controlling information sorts typified in the dialect. A dynamic model of calculation that can be connected crosswise over fundamentally unique (single and multi) processor outlines (in direct difference to C). Client perceptible administrators (in actuality every one of the administrators we regularly underestimate as "built-in" are just part of the Standard Prelude). Bolster for parallel programming with the parallel-condition and Dijkstra semaphores.

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Conclusion General reason algorithmic dialect with a clean predictable and unambiguous linguistic structure. Far reaching completely checked sort framework covering structures, unions, pointers, exhibits and methodology. Methodology might be settled inside techniques and can convey estimations of any sort without you worrying about where the capacity is originating from. Client characterized administrators including client characterized administrator images. Intense control structures can convey estimations of any sort.

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Conclusion Dynamic estimated clusters know their present limits. Exhibit and structure showcases can be utilized as a part of any specific situation. Parallel programming with semaphores. Complex math. Presentations can be interleaved with proclamations. Clear qualification between esteem semantics and reference semantics. No refinement between aggregate time constants and run-time values.

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References http://portal.acm.org/citation.cfm?id=155365&coll=portal&dl=ACM&CFID=14638885&CFTOKEN=99793879 http://www.occl-cam.demon.co.uk/whitepaper.html#FirstExample:Animal http://www.stanford.edu/class/cs242/slides/ml.pdf

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