Ch. 4 Control Statements

Question 1

Before writing a porgram to solve a problem.

Answer 1

• You must have a thorough understanding of teh problem and a carefully planned approach to solving it.
• You must also understand the building blocks that are avaiable and employ proven program construction techniques

Question 2

Any computing problem can be solved by….

Answer 2

Executing a series of actions in a specific order.

Question 3

ALGORITHM

Answer 3

Procedure for solving a problem in terms of the actions to execute and the order in which they execute is called an algorithim.

Question 4

Program Control

Answer 4

Specifying the order in which statements execute in a program is called program control.

Question 5

Pseudocode

Answer 5

An informal language that helps you develop algorithms without having to worry about the strict details of java language syntax

Similar to everyday english, its convenient to user friendly, but it’s not an actual computer programing language

Helps you “think out” a program before attempting to write it in a programing language such as java.

Carefully prepared pseudocode can easily be converted to a corresponding java program.

Question 6

Sequential Execution

Answer 6

Statements in a program executed one after the other in which they’re written

Question 7

Transfer of Control

Answer 7

Various Java statements enable you to specify that the next statement to execute is not necessarily the next one in sequence.

Question 8

Control Structure

Answer 8

• Comes from the field of computer science
• The Java Language Specification refers to “control structures” as “control statements”

Question 9

Selection Statements

Answer 9

• The if statement either performs (selects) an action, if a condition is true, or skips it if it is false.
• 3 Types: Single-Selection, Double Selection Statement, Multiple Selection Statement

Question 10

Java provides the while, do…while and for repetition (looping) statements

Answer 10

• Enable programs to perform statements repeatedly as long as a loop-continuation condition remains true

Question 11

The while and for statements

perform the actions in….

Answer 11

• Their bodies zero or more times - if the loop continuation condition is initially false,the action will not execute.
• The do…while statement performs the action(s) in its body one or more times.

Question 12

The words:

if

else

switch

while

do

for

Answer 12

• Java keywords
• Keywords can not be used as identifiers, such as variable names

Question 13

Every program is formed by…

Answer 13

Combining as many sequence, selection, and repetition statements as is appropriate for the algorithim the program implements.

Question 14

if Single-Selection Statement

Answer 14

• Programs use selection statements to choose among alternative courses action
• The if statement is a single-entry/single-exit control statement

Question 15

Control Statement Stacking

Answer 15

Single-entry/single exit control statements are attached to one another by connecting the exit point of one to the entry point of the next.

Control statement may also be nested inside another control statement

Question 16

if…else Double-Selection Statement

Answer 16

• Performs one action when the condition is true and a different action when the condition is false
• The conditional operator is Java’s only ternary operator

Question 17

All Programs can be written in terms of three types of control structures: _____ ______ and _____

Answer 17

• Sequence
• Selection
• Reptition

Question 18

The _____ statement is used to execute one action when a condition is true and another when the condition is false.

Answer 18

if…else statement

Question 19

Repeating a set of instructions a specific number of times is called ______ repetitiion.

Answer 19

Counter-Controlled

or

Definite

Question 20

When it’s not known in advance how many times a set of statements will be repeated, a(n)_____ value can be used to terminate repetition.

Answer 20

sentinel

signal

flag

dummy

Question 21

The _____ structure is built into Java; by default, statements execute in the order they appear

Answer 21

sequence structure

Question 22

Instance variables of types char, byte, short, int, long, float and double are all given the value _____ by default

Answer 22

0 (zero)

Question 23

Java is a(n)______ language; it requires all variables to have a type.

Answer 23

strongly typed

Question 24

If the increment operator is ______ to variable, first the variable is incremented by 1, then its new value is used in the expression

Answer 24

prefixed

Question 25

An alogorithm is a procedure for solving a problem in terms of the actions to execute and the order in which they execute.

True or False

Answer 25

TRUE

Question 26

A set of statements contained within a pair of parentheses is called a block.

Answer 26

FALSE

A set of statements contained within a pair of braces{ } is called a block

Question 27

A selection statement specifies that an action is to be repeated while some condition remains true.

True or False

Answer 27

FALSE

A repetition statement specifies that an action is to be repeated while some condition remains true

Question 28

A nested control statement appears in the body of another control statement

Answer 28

True

Question 29

Java provides the arithmetic compound assignment operators +=, -=, *=, /=, and %= for abbreviating assignment expressions.

Answer 29

TRUE

Question 30

The primitive types

(boolean, char, byte, shor, int, long, float, and double)

are portable across only Windows Platforms

Answer 30

FALSE

The primitive types

(boolean, char, byte, shor, int, long, float, and double)

are portable across ALL computer platforms that support Java.

Question 31

Specifying the order in which statements execute in a program is called program control.

Answer 31

TRUE

Question 32

The unary cast operator (double) creates a temporary integer copy of its operand.

Answer 32

FALSE

The unary cast operator (double)

creates a temporary floating-point copy of its operand.

Question 33

Instance variables of type boolean are given the value true by default

Answer 33

FALSE

Instance variables of type boolean

are given the value false by default