Chapter 7: JavaScript: Control Statements I

7.1 A procedure for solving a problem in terms of the actions to be executed and the order in which these actions are to be executed is called ________.

a) program control

b) a program structure

c) a control structure

d) an algorithm

d) an algorithm

7.2 Specifying the order in which programming statements are to be executed is called ________.

a) program control

b) a program structure

c) a control structure

d) an algorithm

a) program control

7.3 ________ is an informal language that helps programmers develop algorithms.

a) JavaScript

b) ECMAScript

c) Pseudocode

d) AlgorithmCode

c) Pseudocode

7.4 A program in which all statements are executed one after the other in the order in which they are written exhibits ________.

a) transfer of control

b) algorithms

c) sequential execution

d) direct execution

c) sequential execution

7.5 The word sequence in the term sequence structure refers to the sequence of ________.

a) bits in a JavaScript instruction

b) JavaScript instructions in a script

c) scripts in an HTML file

d) HTML files in a Web site

b) JavaScript instructions in a script

7.6 Research determined that all programs could be written in terms of only three control structures. Which of the following is not one of the three control structures?

a) goto-less structure

b) sequence structure

c) selection structure

d) repetition structure

a) goto-less structure

7.7 Which of the following flowchart symbols indicates that a decision is to be made?

a) diamond

b) oval/circle

c) rectangle

d) flowline

a) diamond

7.8 Which of the following is not a JavaScript selection statement?

a) if...else

b) for...in

c) switch

d) if

b) for...in

7.9 Which of the following is a JavaScript repetition statement?

a) while...repeat

b) do...while

c) do...repeat

d) for...do

b) do...while

7.10 Which of the following is not a JavaScript keyword?

a) break

b) delete

c) sub

d) for

c) sub

7.11 Which of the following statements is correct?

a) If ( studentGrade >= 60 )

document.writeln( "Passed" );

b) if ( studentGrade >= 60 );

document.writeln( "Passed" );

c) if ( studentGrade >= 60 )

document.write( "Passed" );

d) If ( studentGrade >= 60 );

document.write( "Passed" );

c) if ( studentGrade >= 60 )

document.write( "Passed" );

7.12 Which of the following flowchart symbols can represent an if statement?

a) diamond

b) oval/circle

c) rectangle

d) flowline

a) diamond

7.13 What would the browser display if the following code were executed in a script?

var x = 11;

var y = 14;

if ( x > 13 )

if ( y > 13 )

document.writeln( "x and y are > 13" );

else

document.writeln( "x is <= 13" );

a) nothing

b) 11

c) x and y are > 13

d) x is <= 13

a) nothing

7.14 What would the browser display if the following code were executed in a script?

var grade = 59;

if ( grade >= 60 )

document.writeln( "Passed." );

else

document.write( "Failed. " );

document.writeln( "You must take this course again." );

a) Passed.

b) Failed.

c) You must take this course again.

d) Failed. You must take this course again.

d) Failed. You must take this course again.

7.15 What would the browser display if the following code were executed in a script?

var product = 0;

while ( product <= 25 );

product = 2 + product;

a) nothing, the script would result in an inifite-loop error

b) 0

c) 25

d) 26

a) nothing, the script would result in an inifite-loop error

7.16 What would the browser display if the following code were executed in a script?

var product = 0;

while (product >= 25)

product = 2 + product;

document.writeln( product );

a) nothing, the script would result in an error

b) 0

c) 24

d) 26

b) 0

7.17 What would the browser display if the following script were executed?

<script type = "text/javascript">
var count = 0;
var total = 0;
while ( count <= 5 )
{
total = total + 10;
count = count + 1;
}
document.write( total )

a) Nothing; the browser would generate an error.

b) 0

c) 50

d) 60

d) 60

7.18 What would the browser display if the following script were executed?

<script type = "text/javascript">
var count = 5;
var total = 0;
while ( count > -1 )
{
total = total - 10;
count = count - 1;
}
document.write( total );
</script>

a) Nothing; the browser would generate an error.

b) 0

c) -50

d) -60

d) -60

7.19 If the string passed to parseInt contains a floating-point numeric value, parseInt will ________.

a) return NaN

b) return 0

c) round the value to the nearest tenth

d) truncate the floating-point part to be left with an integer value

d) truncate the floating-point part to be left with an integer value

7.20 If the string passed to parseInt contains text characters, parseInt will ________.

a) return NaN

b) return 0

c) return the sum of the characters' ASCII values

d) truncate the text entries

a) return NaN

7.21 What type of loop is shown in the script below?

<script type = "text/javascript">
var gradeValue = 0,
total = 0,
grade = 0;

while ( gradeValue != - 1 )
{
total = total + gradeValue;
grade = window.prompt( "Enter Integer Grade, -1 to Quit:" , "0" );
gradeValue = parseInt( grade );
}
</script>

a) counter controlled

b) sentinel controlled

c) algorithm controlled

d) stepwise controlled

b) sentinel controlled

7.22 The word top in the term top-down stepwise refinement refers to which of the following?

a) the first statement that appears in the script

b) the first statement that appears in the algorithm

c) the single statement that completely represents the script

d) the entire algorithm

c) the single statement that completely represents the script

7.23 What output will the following script produce?

var i = 0;

var j = 3;

var counter = 0;

while ( i < 5 )

{

if (i != j)

counter = counter + i;

i = i + 1

}

document.write( counter );

a) 9

b) 14

c) 3

d) 7

d) 7

7.24 What type of loop should be used in a script that processes test results for 150 students?

a) counter controlled

b) sentinel controlled

c) algorithm controlled

d) stepwise controlled

a) counter controlled

7.25 Which of the following is the correct abbreviation for the statement a = a * 7; ?

a) a =* 7;

b) a *= 7;

c) 7 =* a;

d) 7 *= a;

b) a *= 7;

7.26 If the initial value of a is 15, what new value is assigned to a in the expression a %= 4?

a) 2

b) 3

c) 4

d) 5

b) 3

7.27 What is the value of i after the following statements?

i = 2;

i++;

a) 0

b) 2

c) 3

d) 4

c) 3

7.28 What is the value of i after the following statements?

i = 2;

i--;

i--;

a) 0

b) 1

c) -2

d) -4

a) 0

7.29 What is the output of the following script?

i = 16;

document.write( ++i );

a) 16

b) 17

c) 15

d) Nothing; the browser would generate an error.

b