Deck 4: Making Decisions

Question 1

As a rule of style, when writing an if statement you should indent the conditionally-executed statements.

Answer 1

True

Question 2

If the expression on the left side of the following is true, the expression on the right side will not be checked.
(a > = b) || (c == d)

Answer 2

True

Question 3

Whereas < is called a relational operator, x < y is called a(n)

A) arithmetic operator
B) relative operator
C) relational expression
D) arithmetic expression
E) None of these

Answer 3

C

Question 4

The following code correctly determines whether x contains a value in the range of 0 through 100, inclusive.
if (x > 0 && <= 100)

Question 5

Relational operators allow you to __________ numbers.

A) add
B) multiply
C) compare
D) average
E) None of these

Question 6

The value of result in the following expression will be 0 if x has the value of 12.
result = x > 100 ?
0 :
1;

Question 7

What is assigned to the variable result given the statement below with the following assumptions:
X = 10, y = 7, and x, result, and y are all int variables.
Result = x >= y;

A) 10
B) 7
C) x >= y
D) 1
E) 0

Question 8

After the following code executes, what is the output if user enters 0?
Int x = -1;
Cout << "Enter a 0 or 1:
";
Cin >> x;
If (c)
Cout << "true" << endl;
Else
Cout << "False" << endl;

A) nothing will be displayed
B) False
C) x
D) true
E) 0

Question 9

You should be careful when using the equality operator to compare floating point values because of potential round-off errors.

Question 10

Both of the following if statements perform the same operation.

Question 11

When a relational expression is False, it has the value

A) 1
B) 0
C) 0, 1, or -1
D) -1
E) None of these

Question 12

An expression that has any value other than 0 is considered true by an if statement.

Question 13

The __________ is an equality (or comparison) operator.

A) ==
B) >=
C) !=
D) =
E) None of these

Question 14

The default section is required in a switch statement.

Question 15

The conditional operator takes two operands.

Question 16

What is the output of the following code segment if the user enters 90 for the score?
Cout << "Enter your test score:
";
Cin >> test_score;
If (test_score < 60)
Cout << "You failed the test." << endl;
If (test_score > 60)
Cout << "You passed the test."
Else
Cout << "You need to study harder next time." << endl;

A) You failed the test.
B) You passed the test.
C) You need to study harder next time.
D) You failed the test.
You need to study harder next time.
E) You passed the test.
You need to study harder next time.

Question 17

If the expression on the left side of the following is False, the expression on the right side will not be checked.
(a > = b) && (c == d)

Question 18

After the following code executes, what is the value of my_value if the user enters 0?
Cin >> my_value;
If (my_value > 5)
My_value = my_value + 5;
Else if (my_value > 2)
My_value = my_value + 10;
Else
My_value = my_value + 15;

A) 15
B) 10
C) 25
D) 0
E) 5

Question 19

If you place a semicolon after the statement:
If (x < y)

A) the code will not compile
B) the compiler will interpret the semicolon as a null statement
C) the if statement will always evaluate to False
D) All of these are true
E) None of these

Question 20

What is the output of the following code segment?
Int x = 5;
If (x = 2)
Cout << "This is true!" << endl;
Else
Cout << "This is False!" << endl;
Cout << "That's all, folks!" << endl;

A) This is true!
B) This is False!
C) This is False!
That's all, folks
D) This is true!
That's all folks
E) This is true!
This is False!
That's all, folks!

Question 21

What is the output of the following code?
Int w = 98;
Int x = 99;
Int y = 0;
Int z = 1;
If (x >= 99)
{
If (x < 99)
Cout << y << endl;
Else
Cout << z << endl;
}
Else
{
If (x == 99)
Cout << x << endl;
Else
Cout << w << endl;
}

A) 98
B) 99
C) 0
D) 1
E) None of these

Question 22

Which of the following is evaluated first, given the expression:
A && B || C && !D

A) A && B
B) B || C
C) C && !D
D) !D

Question 23

What will be displayed after the following statements execute?
Int funny = 7, serious = 15;
Funny = serious % 2;
If (funny != 1)
{
Funny = 0;
Serious = 0;
}
Else if (funny == 2)
{
Funny = 10;
Serious = 10;
}
Else
{
Funny = 1;
Serious = 1;
}
Cout << funny << " " << serious << endl;

A) 7 15
B) 0 0
C) 10 10
D) 1 1
E) None of these

Question 24

What is the value of the following expression?
True && False

A) true
B) False
C) -1
D) +1
E) None of these

Question 25

A variable, usually a bool or an int, that signals when a condition exists is known as a(n)

A) relational operator
B) arithmetic operator
C) logical operator
D) flag
E) None of these

Question 26

What is the output of the following code segment if the user enters 23?
Int number;
Cout << "Enter a number:
";
Cin >> number;
If (number > 0)
Cout << "Hi, there!" << endl;
Else
Cout << "Good-bye." << endl;

A) Hi, there! Good-bye.
B) Hi, there!
C) Good-bye.
D) "Hi, there!"
E) nothing will output

Question 27

These operators connect two or more relational expressions into one, or reverse the logic of an expression.

A) relational
B) logical
C) irrational
D) negation
E) None of these

Question 28

If you intend to place a block of statements within an if statement, you must place __________ around the block:

A) parentheses ( )
B) square brackets [ ]
C) angle brackets < >
D) curly braces { }
E) None of these

Question 29

What is the value of donuts after the following statement executes?
Int donuts = 10;
If (donuts != 10)
Donuts = 0;
Else
Donuts += 2;

A) 12
B) 10
C) 0
D) 1
E) None of these

Question 30

Which value can be entered to cause the following code segment to display the message "That number is acceptable"?
Int number;
Cin >> number;
If (number > 10 && number < 100)
Cout << "That number is acceptable.\n";
Else
Cout << "That number is not acceptable.\n";

A) 100
B) 10
C) 99
D) 0
E) all of these

Question 31

What is the value of the following expression?
True && !False

A) true
B) False
C) -1
D) +1
E) None of these

Question 32

When an if statement is placed within the conditionally-executed code of another if statement, this is known as

A) complexity
B) overloading
C) nesting
D) validation
E) None of these

Question 33

This operator represents the logical OR:

A) --
B) ||
C) &&
D) #
E) None of these

Question 34

This operator represents the logical AND:

A) ++
B) ||
C) &&
D) @
E) None of these

Question 35

What is the value of the following expression?
True && true

A) true
B) False
C) -1
D) +1
E) None of these

Question 36

This operator takes an operand and reverses its truth or Falsehood:

A) !&
B) ||
C) =!
D) !
E) None of these

Question 37

What is the value of result after the following code executes?
Int a = 60;
Int b = 15;
Int result = 10;
If (a = b)
Result *= 2;

A) 10
B) 120
C) 20
D) 12
E) code will not execute

Question 38

What is the value of the following expression?
True || False

A) true
B) False
C) -1
D) +1
E) None of these

Question 39

What is the value of donuts after the following statement executes?
Int donuts = 10;
If (donuts = 1)
Donuts = 0;
Else
Donuts += 2;

A) 12
B) 10
C) 0
D) 1
E) None of these

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
E) x == y and x < y

Question 41

What is the output of the following segment of code if the value 4 is input by the user?
Int num;
Int total = 0;
Cout << "Enter a number from 1 to 10:
";
Cin >> num;
Switch (num)
{
Case 1:
Case 2:
Total = 5;
Case 3:
Total = 10;
Case 4:
Total = total + 3;
Case 8:
Total = total + 6;
Default:
Total = total + 4;
}
Cout << total << endl;

A) 0
B) 3
C) 13
D) 23
E) None of these

Question 42

When a program lets the user know that an invalid choice has been made, this is known as:

A) input validation
B) output correction
C) compiler criticism
D) output validation
E) None of these

Question 43

This statement uses the value of a variable or expression to determine where the program will branch to.

A) switch
B) select
C) association
D) scope
E) None of these

Question 44

The default section of a switch statement performs a similar task similar to the __________ portion of an if/else if statement.

A) conditional
B) break
C) trailing else
D) All of these
E) None of these

Question 45

Given the if/else statement:
If (a < 5)
B = 12;
Else
D = 30;
Which of the following performs the same operation?

A) a < 5 ? b = 12 : d = 30;
B) b < 5 ? b = 12 : d = 30;
C) a >= 5 ? d = 30 : b = 12;
D) d = 30 ? b = 12 : a = 5;
E) None of these

Question 46

Input values should always be checked for

A) an appropriate range
B) reasonableness
C) division by zero, if division is taking place
D) All of these
E) None of these

Question 47

Which line in the following program will cause a compiler error?
1 #include
2 using namespace std;
3 int main()
4 {
5 int number = 5;
6 if (number >= 0 && <= 100)
7 cout << "passed.\n";
8 else
9 cout << "failed.\n";
10 return 0;
11 }

A) line 3
B) line 6
C) line 7
D) line 9
E) None will cause an error

Question 48

Given the following code segment, what is the output?
Int x = 1, y = 1, z = 1;
Y = y + z;
X = x + y;
Cout << "result = " << (x < y ?
Y :
X) << endl;

A) result = 0
B) result = 1
C) result = 2
D) result = 3
E) there will be no output

Question 49

Which statement allows you to properly check the char variable code to determine whether it is equal to a C and then output This is a check?

A) if code is equal to C
Cout << "This is a check\n";
B) if (code = "C")
Cout << "This is a check\n";
C) if (code == 'C')
Cout << "This is a check\n";
D) if (code == C)
Cout << "This is a check" << endl;

Question 50

Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression.

A) break
B) exit
C) switch
D) scope
E) None of these

Question 51

Given that x = 2, y = 1, z = 0, what will the following cout statement display?
Cout << "answer = " << (x || !y && z) << endl;

A) answer = 0
B) answer = 1
C) answer = 2
D) None of these