'Static scoping' diaporamas de présentation

Programming Languages B.J. Maclennan

Programming Languages B.J. Maclennan. 3. Generality and Hierarchy: Algol-60. History and Motivation. 3.1. History and Motivation. An international language was needed. Algol-58 and Algol-60 was designed. A formal grammar was used for syntactic description.

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Formal Semantics

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The 50th Anniversary of Algol 60

The 50th Anniversary of Algol 60. Or, w hy long dead programming languages matter. Preliminary Remarks. My motivation? Developer with an interest in PL design & implementation, paradigms, and history. Interested in questions like: is PL X suitable for task Y?

734 views • 53 slides

Names, binding, scope, type checking

Names, binding, scope, type checking. Plan of this part of the course. Names, variables Binding Scope Constants. Variable initialization Type checking. Names and variables. Points to discuss What needs a name? A variable is a six-tuple. Names.

622 views • 38 slides

CSE3302 Programming Languages (n-n-n-notes)

CSE3302 Programming Languages (n-n-n-notes). Summer 2003 Dr. Carter Tiernan. Functional Programming. List Processing - LISP Complex interrelationships among data Recursion in conjunction with conditional expressions Primitive list-handling subroutines Applicative language. LISP.

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Scope

Scope. Scope. Variable scope defines the range of statements over which a variable is visible Local variables of a program unit X are variables that are declared within X and therefore visible within X

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Semantics of Procedures and Scopes

Semantics of Procedures and Scopes. Kinds of Scope. Static or Lexical scope determined by structure of program Scheme, C++, Java, and many compiled languages Dynamic scope determined by path of execution Lisp dialects, Perl, and many interpreted languages Global Scope File scope

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Procedures

Procedures. Primitive procedures +, -, *, etc User-defined procedures Naming a sequence of operations triple = proc (x) + (x, + (x,x)) Recursive definitions exp = proc (x, i) if (i = 0) then 1 else * (x, exp (x,i-1)). User-defined procedures. Concrete Syntax

284 views • 17 slides

Procedures

Procedures. Primitive procedures +, -, *, etc User-defined procedures Naming a sequence of operations triple = proc (a) + (a, + (a,a)) Recursive definitions exp = proc (x, i) if (i = 0) then 1 else * (x, exp (x,i-1)). User-defined procedures. Concrete Syntax

283 views • 17 slides

Project review: JGibberish

Project review: JGibberish. By: Jake Tenberg & Chelsea Shipp. Basic syntax. Types: Integers: 6, 5 Strings: [HelloWorld] Functions: <~name,?(param1),body> Function call: @name@ Variable declaration: (param1,value) Variable reference/call: #param1# Enode and Fnode

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JDB-Lisp Version 2.0

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The role of environments in scoping

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Scope of Variables

Scope of Variables. Scope. Scope of a variable is the range of statements in which the variable is visible in a program A variable is visible in a statement if the variable name could be used in the location the statement occupies

213 views • 5 slides