The concept of Binding

A binding is an association between an attribute and an entity, such as between a variable and its type or value, or between an operation and a symbol.
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Time: 20 minutes
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A relation between an attribute and an entity

A __________ is an association between an attribute and an entity, such as between a variable and its type or value, or between an operation and a symbol.

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Bindings between attributes and entities can take place at

language design time
language implementation time
compile time
load time
link time
run time
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The asterisk symbol (*) is usually bound to the multiplication operation at

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Examples of bindings between attributes and entities

  • the asterisk symbol (*) is usually bound to the multiplication operation at (1) transparent .
  • A data type, such as int in C, is bound to a range of possible values at (2) transparent .
  • A variable in a Java program is bound to a particular data type at (3) transparent .
  • A variable may be bound to a storage cell when the program is loaded into memory at (4) transparent . That same binding does not happen until (5) transparent in some cases, as with variables declared in Java methods.
  • A call to a library subprogram is bound to the subprogram code at (6) transparent .
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language implementation time
language design time
compile time
run time
load time
link time
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Analyze the binding times of the following Java assignment statement

count = count + 5;

  • The type of count is bound at (1) transparent .
  • The set of possible values of count is bound at compiler (2) transparent .
  • The meaning of the operator symbol + is bound at (3) transparent , when the types of its operands have been determined.
  • The internal representation of the literal 5 is bound at compiler (4) transparent .
  • The value of count is bound at (5) transparent with this statement
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compile time
design time
execution time
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A complete understanding of the binding times for the attributes of program entities is _______ for understanding the semantics of a programming language

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A binding is _________ if it first occurs before run time begins and remains unchanged throughout program execution

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If the binding first occurs during run time or can change in the course of program execution, it is called ________

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Before a variable can be referenced in a program, it must be bound to a data ________

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The two important aspects of binding a variable to its data type are

how the type is specified
when the binding takes place
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In programs, types can be specified statically through some form of explicit or implicit declaration

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The time at which a binding between an attribute and an entity takes place is called _____ ______

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