Deck 9: Control I - Expressions and Statements

Question 1

Bracketing keywords are used in the if statement to remove ambiguity.

Answer 1

True

Question 2

Syntactic sugar is a language construct that is completely expressible in terms of other constructs.

Answer 2

True

Question 3

An expression,in its pure mathematical form,produces side effects.

Answer 3

False

Question 4

In normal order evaluation,each operation begins its evaluation before its operands are evaluated.

Question 5

If-expressions never have all of their subexpressions evaluated.

Question 6

Delayed evaluation is sometimes called strict evaluation.

Question 7

To exit a loop completely,the continue statement is used.

Question 8

Lisp requires all expressions to be fully parenthesized.

Question 9

A language has referential transparency when its expressions produce no side effects.

Question 10

If-operators are a special case of operators that delay evaluating their operands.

Question 11

All languages restrict expressions from producing side effects.

Question 12

Alan Turing introduced the guarded if statement.

Question 13

Operators can be written in infix,postfix,or prefix notation.

Question 14

If-then-else is an example of a binary operator.

Question 15

In the absence of side effects,normal order evaluation does not change the semantics of a program.

Question 16

The do statement ensures that the code of a loop is executed at least once.

Question 17

In a case statement,no two listed cases may have the same value after conversion.

Question 18

Functions are written in prefix form.

Question 19

A unary operator can take one or more operands.

Question 20

Most languages use a mix-fix form that distributes the syntax of an if-then-else operator throughout the expression.

Question 21

Sequence operators are used to ____.

A) define a set of variables to declare
B) eliminate side effects
C) allow several expressions to be combined into a single expression and evaluated sequentially
D) specify the execution order of code blocks

Question 22

____ code is code for a function body that is inserted directly at the point where the function would be called.

A) Substitution
B) Control
C) Inline
D) Parameterized

Question 23

A general form for a loop construct is given by Dijkstra's structure called the ____.

A) for loop
B) guarded if
C) guarded do
D) while loop

Question 24

The advantage of postfix and prefix forms for expressions is that ____.

A) they do not require parentheses to express the order in which operators are applied
B) they follow strict rules of operator precedence
C) they follow strict rules that define associativity of operators
D) they do not allow unary operators

Question 25

The termination model resumes control at the exact point an exception is first raised after it is handled.

Question 26

Exception handling is an attempt to imitate in a programming language the features of a hardware interrupt or error trap.

Question 27

Arguments are specified for use with ____.

A) functions
B) unary operators
C) expressions
D) binary operators

Question 28

Evaluating all operands before applying operators is called ____ evaluation.

A) normal order
B) applicative order
C) delayed
D) short-circuit

Question 29

A sentinel-based loop is often used in situations where a series of input values must be processed.

Question 30

Ada uses a(n)____ for its if-statements.

A) enclosing keyword
B) bracketing keyword
C) closest nested first disambiguation
D) dynamic disambiguation rules

Question 31

In a function,the operands are viewed as ____.

A) operators
B) arguments
C) local variables
D) global variables

Question 32

A(n)____ is executed for its side effects and returns no value.

A) expression
B) statement
C) function
D) method

Question 33

Synchronous errors occur in direct reaction to program execution.

Question 34

____ statements transfer control to and from sequences of statements.

A) Transfer
B) Relocation
C) Block
D) Control

Question 35

____ states that any two expressions in a program that have the same value may be substituted for each other anywhere in the program.

A) Referential transparency
B) Normal order evaluation
C) Delayed evaluation
D) Mix-fix form

Question 36

In the guarded if statement,the ____ are the Boolean expressions.

A) guards
B) gatekeepers
C) testers
D) predictors

Question 37

Exception handlers throw exceptions.

Question 38

The most closely nested rule is used to disambiguate ____.

A) nonlocal variable references
B) parameter references
C) if statements
D) function calls

Question 39

____ evaluation stops once the truth value of a Boolean expression is known.

A) Predictive
B) Short-circuit
C) Optimized
D) Applicative order

Question 40

An ambiguity in which it cannot be determined which if statement that should be associated with a single else statement is called the ____ problem.

A) dangling-else
B) ambiguous-else
C) nested-else
D) loose-else

Question 41

____ errors can occur at any moment,not necessarily in response to program code execution.

A) Asynchronous
B) Synchronous
C) Unpredictable
D) Unhandled

Question 42

If an exception is thrown and no handler is found in the block,control is passed to the next enclosing block in a process that is called ____ the exception.

A) transferring
B) redirecting
C) propagating
D) throwing

Question 43

In C++,exception handlers are associated with ____ blocks.

A) catch-release
B) throw-catch
C) try-catch
D) retry-handle

Question 44

If a program crashes,it fails the ____ test.

A) efficiency
B) structured organization
C) graceful exit
D) robustness

Question 45

When an error is thrown,a(n)____ is executed to recover normal execution.

A) recoverer
B) crash-prevention statement
C) exception handler
D) explicit control statement

Question 46

If control resumes at the point where the exception was first raised,the ____ model is being used.

A) resumption
B) redemption
C) termination
D) recovery

Question 47

Stack unwinding occurs when an exception is thrown and control is ____.

A) unable to resume
B) exited back in search of a handler
C) placed elsewhere on the stack
D) moved off the stack and onto the heap

Question 48

In C,the ____ statement skips the remainder of the loop body and resumes execution with the next evaluation of the control expression.

A) break
B) skip
C) update
D) continue

Question 49

The for-loop construct provides for a(n)____ expression,a test expression and an update expression.

A) initializer
B) prefix
C) functional
D) inferential

Question 50

____ are an example of implicit control mechanisms.

A) For-loops
B) Do-Loops
C) Exception handlers
D) Goto statements