Deck 3: Decision Structures

Question 1

All it takes for an OR expression to be true is for one of the subexpressions to be true.

Answer 1

True

Question 2

When two strings are compared using the String class's compareTo method, the comparison is not case sensitive.

Answer 2

False

Question 3

__________ operators are used to determine whether a specific relationship exists between two values.

A) Assignment
B) Arithmetic
C) Logical
D) Relational

Answer 3

D

Question 4

If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

A) str1 = str2
B) str1 && str2
C) str1.equals(str2)
D) str1 += str2

Question 5

If the expression on the left side of the && operator is false, the expression on the right side will not be checked.

Question 6

Programs never need more than one path of execution.

Question 7

Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?

A) str1.equalsIgnoreCase(str2)
B) str1.equalsInsensitive(str2)
C) str1 != str2
D) str1 || str2

Question 8

A block of code is enclosed in a set of

A) braces, { }
B) parentheses, ( )
C) brackets, [ ]
D) double quotes, " "

Question 9

When testing for character values, the switch statement does not test for the case of the character.

Question 10

The System.out.printf method formats a string and displays it in the console window.

Question 11

The String.format method works exactly like the System.out.printf method, except that it does not display the formatted string on the screen.

Question 12

In a switch statement, each of the case values must be unique.

Question 13

In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.

Question 14

A local variable's scope always ends at the closing brace of the block of code in which it is declared.

Question 15

The if-else statement will execute one group of statements if its boolean expression is true or another group if its boolean expression is false.

Question 16

The switch statement is a

A) multiple alternative decision structure
B) nested decision structure
C) sequence structure
D) test expression

Question 17

All it takes for an AND expression to be true is for one of the subexpressions to be true.

Question 18

In an if-else statement, if the boolean expression is false then

A) no statements or blocks are executed
B) the statement or block following the else is executed
C) the first statement or block is executed
D) all the statements or blocks are executed

Question 19

When testing for character values, the switch statement does not test for the case of the character.

Question 20

Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.

Question 21

What will be the value of pay after the following statements are executed?
int hours = 45;
Double pay, payRate = 10.00;
Pay = hours <= 40 ? hours * payRate :
40 * payRate + (hours - 40) *payRate * 1.5;

A) 400.00
B) 450.00
C) 465.00
D) 475.00

Question 22

The __________ statement is used to create a decision structure which allows a program to have more than one path of execution.

A) block
B) if
C) null
D) flag

Question 23

A __________ is a boolean variable that signals when some condition exists in the program.

A) sentinel
B) flag
C) block
D) case

Question 24

What will be the value of x after the following statements are executed?
int x = 10;
Switch (x)
{
Case 10:
X += 15;
Case 12:
X -= 5;
Break;
Default:
X *= 3;
}

A) 30
B) 20
C) 25
D) 5

Question 25

Which of the following expressions determines whether the char variable, chrA, is not equal to the letter 'A'?

A) chrA == 'A'
B) chrA != 'A'
C) chrA || 'A'
D) chrA.notEquals(A)

Question 26

What will be the values of ans, x, and y after the following statements are executed?
int ans = 35, x = 50, y = 50;
If (x >= y)
{
Ans = x + 10;
X -= y;
}
Else
{
Ans = y + 10;
Y += x;
}

A) ans = 60, x = 0, y = 50
B) ans = 45, x = 50, y = 0
C) ans = 45, x = 50, y = 50
D) ans = 60, x = 50, y = 100

Question 27

In Java, when a character is stored in memory, it is actually the __________ that is stored.

A) Unicode number
B) ASCII code
C) floating-point value
D) letter, symbol, or number

Question 28

What will be the value of bonus after the following statements are executed? int bonus, sales = 10000;
If (sales < 5000)
Bonus = 200;
Else if (sales < 7500)
Bonus = 500;
Else if (sales < 10000)
Bonus = 750;
Else if (sales < 20000)
Bonus = 1000;
Else
Bonus = 1250;

A) 750
B) 1250
C) 500
D) 1000

Question 29

The boolean expression in an if statement must evaluate to

A) degrees or radians
B) true or false
C) positive or negative
D) left or right

Question 30

What will be displayed after the following statements are executed?
int y = 10;
If (y == 10)
{
Int x = 30;
X += y;
System.out.println(x);
}

A) 40
B) 30
C) 20
D) The code contains an error and will not compile.

Question 31

What will be the value of discountRate after the following statements are executed?
double discountRate;
Char custType = 'B';
Switch (custType)
{
Case 'A':
DiscountRate = 0.08;
Break;
Case 'B':
DiscountRate = 0.06;
Case 'C':
DiscountRate = 0.04;
Default:
DiscountRate = 0.0;
}

A) 0.08
B) 0.06
C) 0.04
D) 0.0

Question 32

What will be the value of discountRate after the following statements are executed?
double discountRate = 0.0;
Int purchase = 1250;
Char cust = 'N';
If (purchase > 1000)
If (cust == 'Y')
DiscountRate = 0.05;
Else
DiscountRate = 0.04;
Else if (purchase > 750)
If (cust == 'Y')
DiscountRate = 0.04;
Else
DiscountRate = 0.03;
Else
DiscountRate = 0.0;

A) 0.0
B) 0.04
C) 0.05
D) 0.03

Question 33

Java requires that the boolean expression being tested by an if statement be enclosed in

A) a set of parentheses
B) a set of braces
C) a set of double quotes
D) a set of brackets

Question 34

Which of the following statements determines whether the variable temp is within the range of 0 through 100 (inclusive)?

A) if (temp >= 0 && temp <= 100)
B) if (temp > 0 && temp < 100)
C) if (temp >= 0 || temp <= 100)
D) if (temp > 0 || temp < 100)

Question 35

What will be the value of x after the following statements are executed?
int x = 75;
Int y = 60;
If (x > y)
X = x - y;

A) 60
B) 75
C) 15
D) 135

Question 36

What will be the value of ans after the following statements are executed?
int x = 40;
Int y = 40;
If (x = y)
Ans = x + 10;

A) 30
B) 80
C) 50
D) The code contains an error and will not compile.

Question 37

What will be displayed after the following statements are executed?
int ans = 10;
Int x = 65;
Int y = 55;
If (x >= y)
{
Int ans = x + y;
}
System.out.println(ans);

A) 10
B) 120
C) 100
D) The code contains an error and will not compile.

Question 38

A flag may have the values

A) defined or undefined
B) true or false
C) of any range of integers
D) of any Unicode character

Question 39

What will be the value of discountRate after the following statements are executed?
double discountRate = 0.0;
Int purchase = 100;
If (purchase > 1000)
DiscountRate = 0.05;
Else if (purchase > 750)
DiscountRate = 0.03;
Else if (purchase > 500)
DiscountRate = 0.01;

A) 0.0
B) 0.05
C) 0.03
D) 0.01

Question 40

Which of the following expressions will determine whether x is less than or equal to y?

A) x <= y
B) x => y
C) x >= y
D) x =< y

Question 41

Which of the following is the correct boolean expression to test for: int x being a value less than or equal to 500 or greater than 650, or int y not equal to 1000?

A) ((x >= 500 && x < 650) && (y != 1000))
B) ((x <= 500 OR x > 650) AND !))
C) ((x >= 500 || x < 650) || (y != 1000))
D) ((x <= 500 || x > 650) && !(y == 1000))

Question 42

What is the value of ans after the following code has been executed?
int x = 35;
Int y = 20, ans = 80;
If (x < y)
Ans += y;

A) 80
B) 100
C) 35
D) 55

Question 43

An expression tested by an if statement must evaluate to

A) 0 or 1
B) +1 or -1
C) true or false
D) t or f

Question 44

What is the value of x after the following code has been executed?
int x = 75;
Int y = 90;
If (x != y)
X += y;

A) 75
B) 90
C) 15
D) 165

Question 45

What would be the value of bonus after the following statements are executed? int bonus, sales = 85000;
Char dept = 'S';
If (sales > 100000)
If (dept == 'R')
Bonus = 2000;
Else
Bonus = 1500;
Else if (sales > 75000)
If (dept == 'R')
Bonus = 1250;
Else
Bonus = 1000;
Else
Bonus = 0;

A) 2000
B) 1500
C) 1250
D) 1000

Question 46

________ works like this: If the expression on the left side of the && operator is false, the expression the right side will not be checked.

A) short-circuit evaluation
B) reverse logic
C) Boolean logic
D) relational evaluation

Question 47

What does the following code display?
int d = 9, e = 12;
System.out.printf("%d %d\n", d, e);

A) %d %d
B) 9 12
C) %d 9
D) %9 %12

Question 48

Which of the following is the correct boolean expression to test for: int x being a value between, but not including, 500 and 650, or int y not equal to 1000?

A) ((x >= 500 && x <= 650) && (y != 1000))
B) ((x > 500 AND x < 650) OR !))
C) ((x > 500 && x < 650) || (y != 1000))
D) ((x < 500 && x > 650) || !(y == 1000))

Question 49

What would be the value of discountRate after the following statements are executed?
double discountRate = 0.0;
Int purchase = 1250;
If (purchase > 1000)
DiscountRate = .05;
If (purchase > 750)
DiscountRate = .03;
If (purchase > 500)
DiscountRate = .01;
Else
DiscountRate = 0;

A) .05
B) .03
C) .01
D) 0

Question 50

Which of the following is the not equal operator?

A) <>
B) NOT
C) *&
D) !=

Question 51

What is the value of charges after the following code has been executed?
double charges, rate = 7.00;
Int time = 180;
Charges = time <= 119 ? rate * 2 :
Time / 60.0 * rate;

A) 7.00
B) 14.00
C) 21.00
D) 28.00

Question 52

Which of the following will format 12.7801 to display as $12.78?

A) System.out.printf("$%,.2f", 12.7801);
B) System.out.printf("%f", 12.7801);
C) System.out.printf("%.2f $$", 12.7801);
D) System.out.printf("$d", 12.7801);

Question 53

What would be the value of bonus after the following statements are executed? int bonus, sales = 1250;
If (sales > 1000)
Bonus = 100;
If (sales > 750)
Bonus = 50;
If (sales > 500)
Bonus = 25;
Else
Bonus = 0;

A) 100
B) 500
C) 25
D) 0

Question 54

Which of the following will format 12.78 to display as 12.8%?

A) System.out.printf("%2.1d%", 12.78);
B) System.out.printf("%.2f%%", 12.78);
C) System.out.printf("%1.2d%", 12.78);
D) System.out.printf("%.1f%%", 12.78);

Question 55

What will be printed when the following code is executed?
double x = 45678.259;
System.out.printf("%,.2f", x);

A) 45678.259
B) 0,045,678.26
C) 45,678.26
D) 45,678.3

Question 56

What does the following code display?
double x = 12.3798146;
System.out.printf("%.2f\n", x);

A) 123798146
B) 1238
C) %12.38
D) 12.38

Question 57

If you prematurely terminate an if statement with a semicolon, the compiler will

A) not display an error message
B) assume you are placing a null statement there
C) both (a) and (b)
D) none of these

Question 58

What is the value of ans, x, and y after the following statements are executed?
int ans = 0, x = 15, y = 25;
If ( x >= y)
{
Ans = x + 10;
X -=y;
}
Else
{
Ans = y + 10;
Y += x;
}

A) ans = 0, x = 15, y = 25
B) ans = 25, x = -10, y = 25
C) ans = 35, x = 15, y = 40
D) ans = 25, x = 15, y = 40