COP 2822: Fall Term 2003 On-Line Quizzes

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Tutorial Four:
Decision Making with Control Structures and Statements

Chapter 4 Quiz Masters:

Marcelle Bessman (mbessma@ju.edu) [Text Input]

John Taylor (jtaylor@hcc.cc.fl.us) [Consultant]

Multiple Choice [One Answer Only]
Please Note that this test was prepared for the first edition of the text and it may have errors. Please note all errors in the: I have discovered that...Section below.

Question 1

Which of the following statements most accurately defines the syntax of an if statement?

a) The keyword if, a conditional expression in parentheses, square brackets, and executable statement.
b) The keyword if, a conditional expression in parentheses, and executable statements possibly inside curly braces.
c) The keyword if, a conditional expression in curly braces, and executable statements.
d) The keyword if, a conditional expression without parentheses, and executable statements.

Question 2

An iteration is

a) a comment statement
b) an instance of an object
c) an internal JavaScript function
d) one repetition of a loop statement

Question 3

Which of the following statements contains the proper syntax for an if statement?

a) if (x==2) then myvalue = 5;
b) if (x==2), myvalue = 5;
c) if (x==2)[myvalue=5];
d) if (x==2) myvalue = 5;

Question 4

The if statement is used to execute specific programming statements if an evaluated expression returns

a) a value of true
b) a value of false
c) a value of zero
d) none of the above

Question 5

When an if statement block must execute more than one programming statement, all of the executable statements must be

a) contained within square brackets
b) contained within parentheses
c) contained within curly braces
d) defined on the same line

Question 6

The types of operators that can be used with an if statement are _________and logical.

a) arithmetic
b) assignment
c) string
d) comparison

Question 7

What is wrong with the following if statement?
if(x = 2)
myvalue = x;

a) the "myvalue = x" must be in curly braces
b) the "myvalue = x" must be in parentheses
c) the conditional statement uses the assignment operator instead of the comparison operator
d) none of the above, the statement is correct

Question 8

An if statement can include an alternate block of code to execute if the expression evaluates to false by including a(n)

a) if false statement
b) else clause
c) when false statement
d) then do clause

Question 9

The correct syntax for an else clause is shown by which of the following statements?

a) else (myvalue = 5);
b) else [myvalue = 5];
c) else {myvalue = 5};
d) else myvalue = 5;

Question 10

A(n) ______ if statement is one that is contained within an if or if...else statement.

a) embedded
b) related
c) nested
d) subordinate

Question 11

Nested if or if...else statements are coded to

a) increase the programs complexity
b) perform multiple conditional evaluations
c) decrease processing time
d) all of the above

Question 12

What would cause an else clause in an if...else statement to be executed?

a) The conditional expression evaluates to true.
b) The conditional expression evaluates to false.
c) The conditional expression cannot be interpreted by JavaScript
d) It will always execute as soon as the if statement finishes executing

Question 13

The maximum number of nested if statements is

a) 2
b) 5
c) 10
d) unlimited

Question 14

A JavaScript statement that executes a specific set of statements based on the value of an expression is the _____ statement.

a) break
b) if...or
c) switch
d) if...then

Question 15

Specific code segments within a switch statement are identified by

a) case labels
b) switch labels
c) question marks
d) begin statements

Question 16

If a switch statement expression is evaluated and does not match any of the case labels, the switch statement can still execute a block of code if the _____ label is defined.

a) nomatch
b) default
c) altcase
d) dowhen

Question 17

Which of the following statements shows the proper syntax for defining a While loop?

a) while {(conditional expression) then statements};
b) while (conditional expression, counter variable) {statements;}
c) while (conditional expression, statements);
d) while (conditional expression){statements;}

Question 18

A while statement is a loop statement that executes as long as

a) a specific condition is true
b) a specific condition is false
c) a counter has not reached its terminating value
d) none of the above

Question 19

A variable that either increments or decrements its value with each cycle through a loop statement is a(n)

a) repeater
b) counter
c) terminator
d) accumulator

Question 20

What will be the result of executing the following while statement?
var count = 10;
while (count > 0)
document.writeln(count);

a) The loop will repeat 10 times and print the values 10, 9, 8, etc.
b) It will not execute because there is a syntax error
c) This will statement will cause an infinite loop
d) It will execute 10 times and print the values 1, 2, 3, etc.

Question 21

What is the primary difference between a while loop and a do...while loop?

a) Nothing - they function the same
b) A while loop always executes its loop statements at least once
c) The do...while loop executes while a condition is false
d) The do...while loop always executes at least once

Question 22

Which of the following statements is the correct syntax for defining a do...while loop?

a) do {statements,} while (conditional expressions);
b) do while {statements; (conditional expression};
c) do (conditional expression {statements;} while (true);
d) {statements;} do while (conditional expression);

Question 23

How many times will the following do while loop execute?
var count = 0;
do { document.writeln(count);
count += 7;
}while(count < 7);

a) It will not execute because there is a syntax error
b) This do...while loop will cause an infinite loop
c) It will execute twice
d) It will execute only one time

Question 24

How does the syntax for a ";for" loop statement differ from a "while"

a) The syntax is essentially the same
b) The for statement itself can contain code to initialize and increment/decrement its counter variable
c) The while statement itself can contain code to initialize and increment/decrement its counter variable
d) The for statement executes while the given condition is false

Question 25

When is a for statement's counter incremented or decremented?

a) When the condition begin evaluated becomes false
b) At the beginning of every iteration
c) At the end of every iteration
d) Immediately after it is initialized

Question 26

Which of the following shows the correct syntax for the for...in statement?

a) for {(variable in object) statements;}
b) for (variable in property){statements;}
c) for (variable in object){statements;}
d) for (object in variable){statements;}

Question 27

One of the benefits of a for...in statement is that it assigns a(n) ______ to each property in an element.

a) index
b) default value
c) class
d) name

Question 28

The with statement give you the ability to reference the _____ of an object without having to type the object name in every statement.

a) class
b) descriptors
c) properties
d) field values

Question 29

Which of the following statements uses the correct syntax to define the with statement?

a) with{(object) statements;}
b) with(object, property){statements;}
c) with (object){statements;}
d) none of the above

Question 30

What would be the output printed by the following code when executed?
for (count = 1; count < 5; count++){
if(count==3)
continue;
document.write(count);

a) 1,2,3,4
b) 1,2,4
c)1,2
d)1,2,3

True/False Questions

Question 31

An if statement can be used to execute one or more program statements if an evaluated condition returns a value of false.