The fact that in some languages a called block can "see" entities defined in a calling block is called

Which of the following are/could be operations on lists

The special value that points nowhere is (depending on the language)

Which of these statements is most accurate?

An operator-rich language for mathematical and symbolic work was

A name that might be used in two different contexts in a language definition is called a

When one specifies meaning in terms of preconditions and postconditions, one is using

Which of the following statements is/are correct about a parse tree?

An early language that included records and was used for business and commercial work was

Arrays where storage is only used for items that have actually been given values, and not for ones that have not are said to be