54 Letrec PPTs View free & download

3'4 LETREC: A Language with Recursive Procedures PowerPoint PPT Presentation

3'4 LETREC: A Language with Recursive Procedures - ... (vec (make-vector 1))) (let ((new-env (extend-env p-name vec ... vec 0 ; do this, then ... (proc-val (procedure b-var body new-env))) new-env)))) ; return this ...

... (vec (make-vector 1))) (let ((new-env (extend-env p-name vec ... vec 0 ; do this, then ... (proc-val (procedure b-var body new-env))) new-env)))) ; return this ...

| PowerPoint PPT presentation | free to view

Recursion and Iteration Let the entertainment begin PowerPoint PPT Presentation

Recursion and Iteration Let the entertainment begin - (letrec ((countdown (lambda (i) (if (= i 0) 'liftoff (begin (display i) (newline) ... (countdown (- i 1) Recursion and Iteration. 32. Recursion and Stack Frames ...

(letrec ((countdown (lambda (i) (if (= i 0) 'liftoff (begin (display i) (newline) ... (countdown (- i 1) Recursion and Iteration. 32. Recursion and Stack Frames ...

| PowerPoint PPT presentation | free to download

Control Operations PowerPoint PPT Presentation

Control Operations - letrec (letrec ((sum (lambda (ls) (if (null? ls) 0 ( (car ls) (sum (cdr ls) ... (lambda (n) (let fib ((i n)) (cond ((= i 0) 0) ((= i 1) 1) (else ( (fib (- i 1) ...

letrec (letrec ((sum (lambda (ls) (if (null? ls) 0 ( (car ls) (sum (cdr ls) ... (lambda (n) (let fib ((i n)) (cond ((= i 0) 0) ((= i 1) 1) (else ( (fib (- i 1) ...

| PowerPoint PPT presentation | free to view

Programming Languages PowerPoint PPT Presentation

Programming Languages - Can abstract mapping, but need a new construct (a letrec) (define mapper (lambda (f) ... (else (eval (cons ' (list (car lis) (adder2 (cdr lis) ...

Can abstract mapping, but need a new construct (a letrec) (define mapper (lambda (f) ... (else (eval (cons ' (list (car lis) (adder2 (cdr lis) ...

| PowerPoint PPT presentation | free to view

Implementing Recursion - Implementing Recursion

Implementing Recursion

| PowerPoint PPT presentation | free to download

Implementing Recursion - Problem : The closure to be formed must freeze the environment containing the ' ... Delay the creation of the closure until a suitable environment has been formed. ...

Problem : The closure to be formed must freeze the environment containing the ' ... Delay the creation of the closure until a suitable environment has been formed. ...

| PowerPoint PPT presentation | free to download

Refactoring Haskell Programs PowerPoint PPT Presentation

Refactoring Haskell Programs - TS: token stream; AST: annotated abstract syntax tree; MI: module information; Programatica ... AST' extract program from token stream. Program. Implementation ...

TS: token stream; AST: annotated abstract syntax tree; MI: module information; Programatica ... AST' extract program from token stream. Program. Implementation ...

| PowerPoint PPT presentation | free to view

Introduction to Scheme PowerPoint PPT Presentation

Introduction to Scheme - Introduction to Scheme cs784(Prasad) L2Scm *

Introduction to Scheme cs784(Prasad) L2Scm *

| PowerPoint PPT presentation | free to download

PowerPoint Presentation Materials For Instructor PowerPoint PPT Presentation

PowerPoint Presentation Materials For Instructor - Programming Languages

Programming Languages

| PowerPoint PPT presentation | free to view

7'3 CHECKED: A TypeChecked Language PowerPoint PPT Presentation

7'3 CHECKED: A TypeChecked Language - 7.3 CHECKED: A Type-Checked Language. Uses Java- (Pascal-) like type declarations: ... Implement type-of la value-of .... proc-exp (var ty body) ...

7.3 CHECKED: A Type-Checked Language. Uses Java- (Pascal-) like type declarations: ... Implement type-of la value-of .... proc-exp (var ty body) ...

| PowerPoint PPT presentation | free to view

The Environment Model PowerPoint PPT Presentation

The Environment Model - Associations of variables with values are created by: ... Variable resolution: determine a value for a a variable use by a look-up rule (env-nat-var) ...

Associations of variables with values are created by: ... Variable resolution: determine a value for a a variable use by a look-up rule (env-nat-var) ...

| PowerPoint PPT presentation | free to download

3.7 Variable Assignment PowerPoint PPT Presentation

3.7 Variable Assignment - Title: 3.7 Variable Assignment Last modified by: levys Document presentation format: Custom Other titles: Times New Roman Wingdings Symbol Arial Courier New Default ...

Title: 3.7 Variable Assignment Last modified by: levys Document presentation format: Custom Other titles: Times New Roman Wingdings Symbol Arial Courier New Default ...

| PowerPoint PPT presentation | free to view

PowerPoint Presentation Materials For Instructor - ... (f n) (* n n) (f 10)) see Scheme s definition of let in the Scheme Tutorial at http://www ... Adobe Photoshop Image Slide 1 Slide 2 ...

... (f n) (* n n) (f 10)) see Scheme s definition of let in the Scheme Tutorial at http://www ... Adobe Photoshop Image Slide 1 Slide 2 ...

| PowerPoint PPT presentation | free to view

PS4 - {mult} Now apply the closure to 1 and 2... (let ((x 1) (y 2) ... {mult} x: 1. y: 2. and the intermediate closure. and frame are garbage collected. To evaluate: ...

{mult} Now apply the closure to 1 and 2... (let ((x 1) (y 2) ... {mult} x: 1. y: 2. and the intermediate closure. and frame are garbage collected. To evaluate: ...

| PowerPoint PPT presentation | free to download

Scheme - Scheme Like ML, functional focus with imperative features anonymous functions, closures, no return statement, etc. but every binding is mutable

Scheme Like ML, functional focus with imperative features anonymous functions, closures, no return statement, etc. but every binding is mutable

| PowerPoint PPT presentation | free to download

II. Frames and frame structures PowerPoint PPT Presentation

II. Frames and frame structures - When an event generates frame F, then the new environment is (for some E) E itself was similarly generated. In the future, E may become again the current environment ...

When an event generates frame F, then the new environment is (for some E) E itself was similarly generated. In the future, E may become again the current environment ...

| PowerPoint PPT presentation | free to download

Closures and Streams PowerPoint PPT Presentation

Closures and Streams - Closures and Streams cs7100(Prasad) L11Clos * * Supports code reuse. Substitution model specifies what to compute. Environment model computes it efficiently by only ...

Closures and Streams cs7100(Prasad) L11Clos * * Supports code reuse. Substitution model specifies what to compute. Environment model computes it efficiently by only ...

| PowerPoint PPT presentation | free to download

Functions and Recursion PowerPoint PPT Presentation

Functions and Recursion - ... (1 day ago) - If our AST does not have let class nodes, ... only closures in our environment. Is this logic correct? Philip Cannata ...

... (1 day ago) - If our AST does not have let class nodes, ... only closures in our environment. Is this logic correct? Philip Cannata ...

| PowerPoint PPT presentation | free to view

Abstract Syntax PowerPoint PPT Presentation

Abstract Syntax - Abstract Syntax Language of l-expressions ::= | (lambda ( )) | ( ) E.g., concrete syntax Scheme S ...

Abstract Syntax Language of l-expressions ::= | (lambda ( )) | ( ) E.g., concrete syntax Scheme S ...

| PowerPoint PPT presentation | free to download

Programming Languages - Title: PowerPoint Presentation Materials For Instructor s Online Learning Center Last modified by: Phil Cannata Document presentation format: On-screen Show (4:3)

Title: PowerPoint Presentation Materials For Instructor s Online Learning Center Last modified by: Phil Cannata Document presentation format: On-screen Show (4:3)

| PowerPoint PPT presentation | free to view

(define (award) PowerPoint PPT Presentation

(define (award) - And the Oscar goes to Harrison Ford. Meryl Streep. And the Oscar goes to Meryl Streep ... The envelope please...Gwyneth Paltrow. And the Oscar goes to Gwyneth Paltrow ...

And the Oscar goes to Harrison Ford. Meryl Streep. And the Oscar goes to Meryl Streep ... The envelope please...Gwyneth Paltrow. And the Oscar goes to Gwyneth Paltrow ...

| PowerPoint PPT presentation | free to download

Advanced Scheme PowerPoint PPT Presentation

Advanced Scheme - (define countdown (lambda (n) (writeln 'This only appears once' ... Second statement in body of countdown. The second statement produces an infinite loop ...

(define countdown (lambda (n) (writeln 'This only appears once' ... Second statement in body of countdown. The second statement produces an infinite loop ...

| PowerPoint PPT presentation | free to download

Assignments - (lambda() (set! stk (cdr stk)))) (define top (lambda() (car stk))) ) ... Place a cross in the empty class-var box and view class-val box as signifying a vector.

(lambda() (set! stk (cdr stk)))) (define top (lambda() (car stk))) ) ... Place a cross in the empty class-var box and view class-val box as signifying a vector.

| PowerPoint PPT presentation | free to download

Scheme Continued PowerPoint PPT Presentation

Scheme Continued - I suggest that you have DrScheme open to try out the examples that are discussed. ... Finish writing and testing functions in Class03 Scheme and Recursion.doc. ...

I suggest that you have DrScheme open to try out the examples that are discussed. ... Finish writing and testing functions in Class03 Scheme and Recursion.doc. ...

| PowerPoint PPT presentation | free to view

Automatic Verification of Pointer Programs using Grammar-based Shape Analysis PowerPoint PPT Presentation

Automatic Verification of Pointer Programs using Grammar-based Shape Analysis - Automatic Verification of Pointer Programs using Grammar-based Shape Analysis Hongseok Yang Seoul National University (Joint Work with Oukseh Lee and Kwangkeun Yi)

Automatic Verification of Pointer Programs using Grammar-based Shape Analysis Hongseok Yang Seoul National University (Joint Work with Oukseh Lee and Kwangkeun Yi)

| PowerPoint PPT presentation | free to download

Some details of implementation PowerPoint PPT Presentation

Some details of implementation - associates M with the compiled function ... (their use only in scope was assured at compile-time ) ... Compiler compiles each non-local use v to code for a ...

associates M with the compiled function ... (their use only in scope was assured at compile-time ) ... Compiler compiles each non-local use v to code for a ...

| PowerPoint PPT presentation | free to download

Agenda Clase 16 PowerPoint PPT Presentation

Agenda Clase 16 - Concepto y Caracter sticas de la Programaci n Funcional. ... Interacci n con el usuario a trav s de un ciclo 'leer-evaluar-imprimir' ...

Concepto y Caracter sticas de la Programaci n Funcional. ... Interacci n con el usuario a trav s de un ciclo 'leer-evaluar-imprimir' ...

| PowerPoint PPT presentation | free to view

Int - Title: Cb00853-1 Lenguajes de programaci n Author: Carlos Rodr guez Lucatero Last modified by: Campus Ciudad de M xico Created Date: 8/8/2001 2:20:44 AM

Title: Cb00853-1 Lenguajes de programaci n Author: Carlos Rodr guez Lucatero Last modified by: Campus Ciudad de M xico Created Date: 8/8/2001 2:20:44 AM

| PowerPoint PPT presentation | free to download

The Swine Before Perl PowerPoint PPT Presentation

The Swine Before Perl - (define b-machine-states '((init (c more)) (more (a more) (d more) (r end)) (end (r end) ... (define (v s) ((if (eq? ( first s) 'c) (automaton init (init : (c ...

(define b-machine-states '((init (c more)) (more (a more) (d more) (r end)) (end (r end) ... (define (v s) ((if (eq? ( first s) 'c) (automaton init (init : (c ...

| PowerPoint PPT presentation | free to download

Denotational Semantics PowerPoint PPT Presentation

Denotational Semantics - We can explain the meaning of programs in using the Strachey and Scott metalanguage ... Denotational techniques provide give meaning to programs by relating syntax to ...

We can explain the meaning of programs in using the Strachey and Scott metalanguage ... Denotational techniques provide give meaning to programs by relating syntax to ...

| PowerPoint PPT presentation | free to download

Lesson 5 Simple extensions of the typed lambda calculus PowerPoint PPT Presentation

Lesson 5 Simple extensions of the typed lambda calculus - outr(2,b) = b. isl (1,a) = true; isl (2,b) = false. isr (1,a) = false; isr (2,b) = true ... t2)(outr z) 1/31/02. Lesson 5. 23. Sums - Typing |- case t of inl x1 ...

outr(2,b) = b. isl (1,a) = true; isl (2,b) = false. isr (1,a) = false; isr (2,b) = true ... t2)(outr z) 1/31/02. Lesson 5. 23. Sums - Typing |- case t of inl x1 ...

| PowerPoint PPT presentation | free to download

Programming Languages 2006 The Lambda Calculus PowerPoint PPT Presentation

Programming Languages 2006 The Lambda Calculus - Intuitively, beta reduction models computations by simplifying expressions: ... An encoding of boolean values: true xy.x. false xy.y. 27. The Lambda Calculus ...

Intuitively, beta reduction models computations by simplifying expressions: ... An encoding of boolean values: true xy.x. false xy.y. 27. The Lambda Calculus ...

| PowerPoint PPT presentation | free to view

System F with type equality coercions

| PowerPoint PPT presentation | free to view

Denotational semantics, Pure functional programming PowerPoint PPT Presentation

Denotational semantics, Pure functional programming - meaning of e2 where f denotes function ... Trivial Example: Binary Numbers. Syntax ... Not many people really prove their code correct. Haskell Quicksort. Very ...

meaning of e2 where f denotes function ... Trivial Example: Binary Numbers. Syntax ... Not many people really prove their code correct. Haskell Quicksort. Very ...

| PowerPoint PPT presentation | free to view

How%20to%20transform%20an%20abstract%20analyzer%20into%20an%20abstract%20verifier PowerPoint PPT Presentation

How%20to%20transform%20an%20abstract%20analyzer%20into%20an%20abstract%20verifier - Type verification in a functional language. we choose the let-polymorphic type interpreter ... a further abstraction in which we forget quantifiers and constraints ...

Type verification in a functional language. we choose the let-polymorphic type interpreter ... a further abstraction in which we forget quantifiers and constraints ...

| PowerPoint PPT presentation | free to download

Lets Scheme - (quote (Pat Kim)) (append '(Pat Kim) '(Robin Sandy)) (length (append '(Pat Kim) ... Note that in Scheme set-car! and set-cdr! do not introduce new ...

(quote (Pat Kim)) (append '(Pat Kim) '(Robin Sandy)) (length (append '(Pat Kim) ... Note that in Scheme set-car! and set-cdr! do not introduce new ...

| PowerPoint PPT presentation | free to view

How to transform an analyzer into a verifier PowerPoint PPT Presentation

How to transform an analyzer into a verifier - Codish & Lagoon, TCS 2000. 3. THE VERIFICATION METHOD: abstract interpretation ... a type analyzer for logic programs (by Codish & Lagoon) available from a web site ...

Codish & Lagoon, TCS 2000. 3. THE VERIFICATION METHOD: abstract interpretation ... a type analyzer for logic programs (by Codish & Lagoon) available from a web site ...

| PowerPoint PPT presentation | free to download

COMP313A Functional Programming (1) PowerPoint PPT Presentation

COMP313A Functional Programming (1) - assignment statement needed to change the binding for a ... Higher order functions are the 'guts' of functional programming. 48. Higher Order Functions ...

assignment statement needed to change the binding for a ... Higher order functions are the 'guts' of functional programming. 48. Higher Order Functions ...

| PowerPoint PPT presentation | free to view

Paso de par - Paso de par metros y arreglos Otras caracter sticas de los LP Modificando nuestro interprete podremos: Seguir explorando las caracter sticas de los LP s Expresar ...

Paso de par metros y arreglos Otras caracter sticas de los LP Modificando nuestro interprete podremos: Seguir explorando las caracter sticas de los LP s Expresar ...

| PowerPoint PPT presentation | free to download

Closures and Streams - Closure and Models. Substitution (lambda (y) ( 4 y) ... (op (car seq) (accumulate op init (cdr seq))) cs784(Prasad) L11Clos. 15 ...

Closure and Models. Substitution (lambda (y) ( 4 y) ... (op (car seq) (accumulate op init (cdr seq))) cs784(Prasad) L11Clos. 15 ...

| PowerPoint PPT presentation | free to download

More Scheme - append takes two arguments and returns the concatenation of two lists. ... (map car '((a b) (c d) (e f) (g h))) (a c e g) Takes two arguments. Function and a list ...

append takes two arguments and returns the concatenation of two lists. ... (map car '((a b) (c d) (e f) (g h))) (a c e g) Takes two arguments. Function and a list ...

| PowerPoint PPT presentation | free to download

Practical Techniques for Language Design and Prototyping PowerPoint PPT Presentation

Practical Techniques for Language Design and Prototyping - ... Semantics (Felleisen-style) Executable Logical ... Executable Felleisen-style Semantics ... ML-style syntax, but first-order except for some builtin functions ...

... Semantics (Felleisen-style) Executable Logical ... Executable Felleisen-style Semantics ... ML-style syntax, but first-order except for some builtin functions ...

| PowerPoint PPT presentation | free to view

define makediningphilosophers n getforks PowerPoint PPT Presentation

define makediningphilosophers n getforks - (semaphore-post (vector-ref forks i)) (semaphore-post (vector-ref forks j)) (f)))) f) ... uncaught exception: 12 (call-with-current-continuation (lambda (k) expr) ...

(semaphore-post (vector-ref forks i)) (semaphore-post (vector-ref forks j)) (f)))) f) ... uncaught exception: 12 (call-with-current-continuation (lambda (k) expr) ...

| PowerPoint PPT presentation | free to download

Macros - is cute but brittle. Pattern variables are defaults. No hygiene escapes ... Offers constraint-based pattern matching and code quotes all with automatic hygiene ...

is cute but brittle. Pattern variables are defaults. No hygiene escapes ... Offers constraint-based pattern matching and code quotes all with automatic hygiene ...

| PowerPoint PPT presentation | free to download

Funkcion - Title: Vestav n predik ty Author: Laborator Barbora Last modified by: jh Created Date: 10/17/1997 2:06:04 PM Document presentation format: P edv d n na ...

Title: Vestav n predik ty Author: Laborator Barbora Last modified by: jh Created Date: 10/17/1997 2:06:04 PM Document presentation format: P edv d n na ...

| PowerPoint PPT presentation | free to download

Some abstract interpreters for type inference PowerPoint PPT Presentation

Some abstract interpreters for type inference - (match sem e1 (bind(bind(r,i1,Funval(ff1)),i2,Funval(ff2))) with Funval f - f d) ... 'x' is bound to a new variable Vvar '0' in the environment r ...

(match sem e1 (bind(bind(r,i1,Funval(ff1)),i2,Funval(ff2))) with Funval f - f d) ... 'x' is bound to a new variable Vvar '0' in the environment r ...

| PowerPoint PPT presentation | free to download

CSCI 3136 Principles of Programming Languages Part III: Semantic Analysis Names, Scopes, and Binding PowerPoint PPT Presentation

CSCI 3136 Principles of Programming Languages Part III: Semantic Analysis Names, Scopes, and Binding - enforced by compiler at compile-time. Dynamic semantic rules ... regular expression-like syntax. CSCI 3136, Part III: Semantic Analysis. 16 ...

enforced by compiler at compile-time. Dynamic semantic rules ... regular expression-like syntax. CSCI 3136, Part III: Semantic Analysis. 16 ...

| PowerPoint PPT presentation | free to view

Abstract Syntax - Parse: Concrete to Abstract Syntax. cs784 (Prasad) L6AST. 7 (current ... (parse-expression '(lambda (x) (f x))) (lambda-exp x (app-exp (var-exp f) (var-exp x) ...

Parse: Concrete to Abstract Syntax. cs784 (Prasad) L6AST. 7 (current ... (parse-expression '(lambda (x) (f x))) (lambda-exp x (app-exp (var-exp f) (var-exp x) ...

| PowerPoint PPT presentation | free to download

More on types PowerPoint PPT Presentation

More on types - Make sure G : t never holds. Imperative Features. soundness can be affected! ... subst (Abstraction t) f = Abstraction (subst t g) ...

Make sure G : t never holds. Imperative Features. soundness can be affected! ... subst (Abstraction t) f = Abstraction (subst t g) ...

| PowerPoint PPT presentation | free to view

Definition: Given a function f(n), PowerPoint PPT Presentation

Definition: Given a function f(n), - Definition: Given a function f(n), O(f(n)) is the set of all functions g(n) ... So perhaps 13 works -- construct a proof that it works for all n! ...

Definition: Given a function f(n), O(f(n)) is the set of all functions g(n) ... So perhaps 13 works -- construct a proof that it works for all n! ...

| PowerPoint PPT presentation | free to download

Fundamentals PowerPoint PPT Presentation

Fundamentals - Formal system with three parts. Notation for function expressions. Proof system for ... one hundred and three good things, five bad kings and two genuine dates. ...

Formal system with three parts. Notation for function expressions. Proof system for ... one hundred and three good things, five bad kings and two genuine dates. ...

| PowerPoint PPT presentation | free to download

CS 611: Lecture 33 PowerPoint PPT Presentation

CS 611: Lecture 33 - Cornell University Computer Science Department. Andrew Myers ... where {a1,...,an} = FTV(t) - FTE(G) FTE(G) is removed to avoiding capturing type variables: ...

Cornell University Computer Science Department. Andrew Myers ... where {a1,...,an} = FTV(t) - FTE(G) FTE(G) is removed to avoiding capturing type variables: ...

| PowerPoint PPT presentation | free to download

Calculating Sized Types PowerPoint PPT Presentation

Calculating Sized Types - Context-based Specialisation. Sized Types Inference. 19. ack 0 m = m 1. ack (n 1) 0 = ack n 1 ... Specialisation can eliminate redundant tests. Context Specialisation ...

Context-based Specialisation. Sized Types Inference. 19. ack 0 m = m 1. ack (n 1) 0 = ack n 1 ... Specialisation can eliminate redundant tests. Context Specialisation ...

| PowerPoint PPT presentation | free to view

Programming Languages: Design, Specification, and Implementation PowerPoint PPT Presentation

Programming Languages: Design, Specification, and Implementation - What does it mean for a context-free grammar to be ambiguous? ... What is a test-and-set or compare-and-swap instruction? What is a semaphore? ...

What does it mean for a context-free grammar to be ambiguous? ... What is a test-and-set or compare-and-swap instruction? What is a semaphore? ...

| PowerPoint PPT presentation | free to download

Letrec PowerPoint PPT Presentations