321-Quiz-08 - Names/Binding/Scope

Binding is

• an association between a variable and its type value

• is an association between an operation and a symbol

• can be static or dynamic

• is another way to link programs together

The type of a variable

• determines the range of values the variable can store

• determines the operations defined for values of the type

• only matters for integer types

• does not exists in machine language

• Can be used to catch some errors early

The scope of a variable is

• the range of statements where it is visible

• how often it is referenced in a program

• how much memory it uses

• the number of programs it appears in

A referencing environment

• defines the set of statements visible to the variables of the statement

• applies only the local variables visible to the statement

• defines the set of statements which can validly reference a name

• for a name is its defining scope and all nested subscopes

Output in a a language that uses Dynamic Scoping :

• 30
  20
  10

• 30

  10

  20

• 10

  10
  10

• 10
  20
  30
  

Output in a a language that uses Static Scoping :

• 30
  20
  10

• 30

  10

  20

• 10

  10
  10

• 10
  20
  30
  

A symbol table is a data structure kept by a translator that allows it to keep track of each declared name and its binding.

• true

• false

Which of the following are in the group called basic bindings

• name

• type

• location

• lifetime

• scope

In _______ scopes, same name can be bound to different entities without interference.

• nested

• disjoint

• static

• dynamic

Some languages have a construct that allows access to an entity that currently is not visible because its name has been used in an inner scope. What is this construct/feature called?

• golden accessor

• fish

• universal scope accessor

• scope resolution operator

• scope accessor