Chapter 8

Question 1

Control Statements provide three primary capabilities. What are they?

Answer 1

1) Sequence
2) Selection
3) Iteration

Question 2

What are the four categories of control statements?

Answer 2

1) selection
2) multiple selection
3) iterative
4) unconditional branching

Question 3

A ___ statement provides the means of choosing between two or more execution paths in a program.

Answer 3

selection

Question 4

Selection statements fall into two categories: ___-___ & ___-___

Answer 4

two-way & n-way

Question 5

General design of two-way selection statement is

Answer 5

if (expression)
then
else

Question 6

A ___ ___ is a control statement and the collection of statements whose execution it controls.

Answer 6

control structure

Question 7

What is the one design issue that is relevant to all of the selection and iteration control statements?

Answer 7

Should the control structure have multiple entries?

Question 8

What are the three design issues for two-way selectors?

Answer 8

1) What is the foe form and type of the expression that controls the selection
2) How are the then and else clauses specified
3) How should the meaning of nested selectors be specified?

Question 9

The ___ - ___ statement allows the selection of one of any number of statements or statement groups.q

Answer 9

multiple-selection

Question 10

What are the design issues associated with n-way selection statements? (5)

Answer 10

1) What is the form and type of the expression that controls the selection
2) How are the selectable segments specified
3) Is execution flow through the structure restricted to include just a single selectable segment
4) How are the case values specified
5) How should unrepresented selector expression values be handled, if at all

Question 11

What is the common example of an n-way selection statement?

Answer 11

switch/case
of
if 
elseif
else

Question 12

An ___ statement is one that causes a statement or collection of statement to be executed zero, one or more times.

Answer 12

iterative

Question 13

The ___ of an iterative statment is the collection of statements whose execution is controlled by the iteration statement.

Answer 13

body

Question 14

We use the term ___ to mean that the test for loop completion occurs before the loop body is executed and ___ to mean that it occurs after the loop body is executed.

Answer 14

pretest, posttest

Question 15

A counting iterative control statement has a variable, called the ___ variable, in which the count value is maintained. It also includes some means of specifying the ___ and ___ values of the loop variable, and the difference between sequential loop variable values, often called the ____.

Answer 15

loop, initial, terminal, stepsize

Question 16

The initial, terminal and stepsize specifications of a loop are called the loop ___.

Answer 16

parameters

Question 17

What are the four design issues with iterative counter-controlled statements?

Answer 17

1) What are the type and scope of the loop variable
2) Should it be legal for the loop variable or loop parameters to be changed in the loop, and if so, does the change affect loop control?
3) Should the loop parameters be evaluated only once, or once for every iteration?
4) What is the value of the loop variable after loop termination?

Question 18

What are the design issues for logically controlled loops (2)?

Answer 18

1) Should the control be pretest or posttest (Top or bottom)

2) Should the logically controlled loop be a special form of a counting loop or a separate statement

Question 19

What are the design issues for user-located loop control mechanisms? (2)

Answer 19

1) Should the conditional mechanism be an integral part of the exit?
2) Should only one loop body be exited, or can enclosing loops also be exited?

Question 20

An ___ ___ statement transfers execution control to a specified location ion the program.

Answer 20

unconditional branch

Question 21

In some languages, each line in the selection statement, consisting of a Boolean expression and a statement or statement sequence is called a ___ ___.

Answer 21

guarded command

Question 22

According to Bohm and Jacopini, the theoretical resultat that only ___, ___, and ___ ___ ___ are absolutely required to express computations.

Answer 22

sequence, selection, and pretest logical loops

Question 23

What is the obvious misues of the Bohm and jacopini result?

Answer 23

To argue against the inclusion of any control structures beyond selection and pretest logical loops.