Deck 4: Making Decisions

Question 1

What will the following segment of code output? You can assume the user enters a grade of 90 from the keyboard. cout << "Enter a test score: ";
Cin >> test_score;
If (test_score < 60);
Cout << "You failed the test!" << endl;
If (test_score > 60)
Cout << "You passed the test!" << endl;
Else
Cout << "You need to study for the next test!";

A) You failed the test!
B) You passed the test!
C) You failed the test!
You passed the test!
D) You failed the test!
You did poorly on the test!
E) None of the above

Answer 1

C

Question 2

This operator represents the logical AND.

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

Answer 2

C

Question 3

Relational operators allow you to ____________ numbers.

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

Answer 3

C

Question 4

After execution of the following code, what will be the value of input_value if the value 0 is entered at the keyboard at run time? cin >> input_value;
If (input_value > 5)
Input_value = input_value + 5;
Else if (input_value > 2)
Input_value = input_value + 10;
Else
Input_value = input_value + 15;

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

Question 5

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

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

Question 6

What is the output of the following segment of code if 4 is input by the user when asked to enter a number? 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) 28
E) None of these

Question 7

What will be the output of the following code segment after the user enters 0 at the keyboard? int x = -1;
Cout << "Enter a 0 or a 1 from the keyboard: ";
Cin >> x;
If (x)
Cout << "true" << endl;
Else
Cout << "false" << endl;

A) Nothing will be displayed
B) false
C) x
D) true

Question 8

When a relational expression is false, it has the value _____.

A) one
B) zero
C) zero, one, or minus one
D) less than zero
E) None of these

Question 9

What will following segment of code output? int x = 5;
If (x = 2)
Cout << "This is true!" << endl;
Else
Cout << "This is false!" << endl;
Cout << "This is all folks!" << endl;

A) This is true!
B) This is false!
C) This is true!
This is false!
D) This is true!
This is all folks!
E) None of these

Question 10

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

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

Question 11

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

A) Arithmetic operator
B) Relative operator
C) Relational expression
D) Largeness test
E) None of these

Question 12

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 13

This is a variable, usually a boolean or an integer, that signals when a condition exists.

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

Question 14

Input values should always be checked for

A) Appropriate range
B) Reasonableness
C) Division by zero, if division is taking place
D) All of these
E) None of these

Question 15

x <= (y * 2)

A) 3, 4, 6, 7 are False
B) Only 5 is False
C) 3 and 4 are False
D) All are False
E) None of these

Question 16

This operator is used in C++ to represent equality.

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

Question 17

What will the following segment of code output? score = 40;
If (score > 95)
Cout << "Congratulations!\n";
Cout << "That's a high score!\n";
Cout << "This is a test question!" << endl;

A) This is a test question!
B) Congratulations!
That's a high score!
This is a test question!
C) That's a high score!
This is a test question!
D) Congratulations!
That's a high score!
E) None of these

Question 18

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 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 the above.
E) None of these.

Question 20

This operator takes an operand and reverses its truth or falsehood.

A) ||
B) relational
C) arithmetic
D) !
E) None of these

Question 21

This operator performs a logical NOT operation.

A) --
B) !
C) <>
D) ><
E) None of these

Question 22

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

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

Question 23

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

A) true
B) false
C) -1
D) +1

Question 24

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

A) 0
B) 1
C) 2
D) 3
E) None of these

Question 25

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" and then advance to a new line?

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

Question 26

What will the following program display? #include
Using namespace std;
Int main()
{
Int a = 0, b = 2, x = 4, y = 0;
Cout << (a == b) << " ";
Cout << (a != b) << " ";
Cout << (b <=x) << " ";
Cout << (y > a) << endl;
Return 0;
}

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

Question 27

In C++ the = operator indicates

A) equality
B) assignment
C) subtraction
D) negation
E) None of these

Question 28

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

A) true
B) false
C) -1
D) +1

Question 29

The ________ of a variable is limited to the block in which it is declared.

A) precedence
B) associativity
C) scope
D) branching ability
E) None of these

Question 30

What will the following segment of code output if 11 is entered at the keyboard? int number;
Cin >> number;
If (number > 0)
Cout << "C++";
Else
Cout << "Soccer";
Cout << " is ";
Cout << "fun" << endl;

A) C++ is fun
B) Soccer is fun
C) C++
D) C++fun
E) Soccerfun

Question 31

What is the value of the following expression? false || true

A) true
B) false
C) -1
D) +1

Question 32

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

A) 12
B) 10
C) 0
D) 1

Question 33

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 34

What is the value of the following expression? true || true

A) true
B) false
C) -1
D) +1

Question 35

Given that x = 2, y = 1, and 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

Question 36

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 37

This operator is known as the logical OR operator.

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

Question 38

What will the following program segment display? 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 39

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

A) parentheses ( )
B) square brackets [ ]
C) quotation marks ? ?
D) curly braces { }
E) None of these

Question 40

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

A) 12
B) 10
C) 0
D) 2

Question 41

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 42

If the sub-expression on the left side of the || operator is true, the expression on the right side will not be checked.

Question 43

Both of the following if statements perform the same operation.
if (sales > 10000)
commissionRate = 0.15;
if (sales > 10000) commissionRate = 0.15;

Question 44

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

Question 45

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

Question 46

What will be the value of result after the following code has been executed? int a = 60;
Int b = 15;
Int result = 10;
If (a = b)
Result *= 2;

A) 10
B) 120
C) 20
D) This code will not compile

Question 47

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 48

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

Question 49

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

Question 50

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

Question 51

Which line in the following program will cause a compiler error? 1 #include
2 using namespace std;
3
4 int main()
5 {
6 int number = 5;
7
8 if (number >= 0 && <= 100)
9 cout << "passed.\n";
10 else
11 cout << "failed.\n";
12 return 0;
13 }

A) 6
B) 8
C) 10
D) 9

Question 52

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

Question 53

The default section is required in a switch statement.