Deck 2: C++ Basics

Question 1

It is legal to declare more than one variable in a single statement.

Answer 1

True

Question 2

Each time a loop body executes is known as an _______________________.

Answer 2

iteration

Question 3

The body of a do-while loop always executes at least once.

Answer 3

True

Question 4

Is << used for input or output? ____________

Question 5

int myValue; is called a _______________________.

Question 6

if-else statements that are inside other if-else statements are said to be _______________.

Question 7

A loop that always executes the loop body at least once is known as a _____________ loop.

Question 8

>> is known as the stream ____________ operator.

Question 9

What is the correct conditional statement to determine if x is between 19 and 99? __________________

Question 10

<< is called the stream ____________________ operator.

Question 11

The braces for a loop define the ____________ of the loop.

Question 12

What is the opposite of x < 20 && x > 12)? _______________________

Question 13

Every line in a program should have a comment.

Question 14

The body of a while loop may never execute.

Question 15

Loops are used when we need our program to make a choice between two or more things.

Question 16

In the following code fragment, x has the value of 3.
int x = 3;

Question 17

The integer 0 is considered true.

Question 18

The opposite of less than is greater than

Question 19

Variable names may begin with a number.

Question 20

The opposite of x >3 && x < 10) is x < 3 && x > 10)

Question 21

The _______ keyword in C++11 determines the type of a variable based on the data type that the variable is set to.

Question 22

Another way to write the value 3452211903 is

A) 3.452211903e09
B) 3.452211903e-09
C) 3.452211903x09
D) 3452211903e09

Question 23

Which of the following is a valid identifier?

A) 3com
B) three_com
C) 3_com
D) 3-com
E) dollar$

Question 24

What is the value of x after the following statements?
Int x;
X = 0;
X = x + 30;

A) 0
B) 30
C) 33
D) garbage

Question 25

What is the value of x after the following statements?
Int x, y, z;
Y = 10;
Z = 3;
X = y * z + 3;

A) Garbage
B) 60
C) 30
D) 33

Question 26

What is the value of x after the following statements?
Float x;
X = 15/4;

A) 3.75
B) 4.0
C) 3.0
D) 60

Question 27

What is the value of x after the following statements?
Int x;
X = 15/4;

A) 15
B) 3
C) 4
D) 3.75

Question 28

What is the value of x after the following statements?
Int x;
X = x + 30;

A) 0
B) 30
C) 33
D) garbage

Question 29

What is the output of the following code?
Cout << "This is a \\" << endl;

A) This is a
B) This is a \
C) nothing, it is a syntax error
D) This is a \ endl

Question 30

Which of the following is not a valid identifier?

A) return
B) myInt
C) myInteger
D) total3

Question 31

The stream that is used for output to the screen is called ___________.

Question 32

Write the loop condition to continue a while loop as long as x is negative. ____________________

Question 33

What is the value of x after the following statements?
Int x;
X = 15 %4;

A) 15
B) 4
C) 3
D) 3.75

Question 34

In a compound logical and &&) expression, the evaluation of the expression stops once one of the terms of the expression is false. This is known as ______________ evaluation.

Question 35

Which of the following lines correctly reads a value from the keyboard and stores it in the variable named myFloat?

A) cin > > myFloat;
B) cin << myFloat;
C) cin >> "myFloat";
D) cin >> myFloat >> endl;

Question 36

What is the output of the following code?
Float value;
Value = 33.5;
Cout << value << endl;

A) 33.5
B) 33
C) value
D) garbage

Question 37

Which of the following statements is NOT legal?

A) char ch='b';
B) char ch='0';
C) char ch=65;
D) char ch="cc";

Question 38

What is the output of the following code?
Float value;
Value = 33.5;
Cout << "value" << endl;

A) 33.5
B) 33
C) value
D) garbage

Question 39

The stream that is used for input from the keyboard is called ___________.

Question 40

When must we use braces to define the body of a contitional expression? ______________

Question 41

What is the correct way to write the condition y < x < z?

A) y < x < z)
B) y < x) && z)
C) y > x) || y < z))
D) y < x) && x < z))

Question 42

If x has the value of 3, y has the value of -2, and w is 10, is the following condition true or false?
If x < 2 && w < y)

A) true
B) false

Question 43

What is the value of x after the following statement?
Float x;
X = 3.0 / 4.0 + 3 + 2 )/ 5

A) 5.75
B) 5.75
C) 1.75
D) 3.75

Question 44

Given the following code fragment, what is the final value of y?
Int x, y;
X = -1;
Y = 0;
Whilex < 3)
{
Y += 2;
X += 1;
}

A) 2
B) 10
C) 6
D) 8

Question 45

What is the value of x after the following statements?
Double x;
X = 0;
X += 3.0 * 4.0;
X -= 2.0;

A) 22.0
B) 12.0
C) 10.0
D) 14.0

Question 46

Given the following code fragment, and an input value of 5, what is the output?
Int x;
If x< 3)
{
Cout << "small\n";
}
Else
{
If x < 4)
{
Cout << "medium\n";
}
Else
{
If x < 6)
{
Cout << "large\n";
}
Else
{
Cout << "giant\n";
}
}
}

A) small
B) medium
C) large
D) giant

Question 47

What is the value of x after the following statement?
Float x;
X = 3.0 / 4.0 + 3 + 2 / 5

A) 5.75
B) 5.75
C) 1.75
D) 3.75

Question 48

Given the following code fragment, what is the output?
Int x=5;
If x > 5)
Cout << "x is bigger than 5. ";
Cout <<"That is all. ";
Cout << "Goodbye\n";

A) x is bigger than 5. That is all
B) x is bigger than 5
C) That is all. Goodbye
D) Goodbye

Question 49

Given the following code fragment, and an input value of 3, what is the output that is generated?
Int x;
Cout <<"Enter a value\n";
Cin >> x;
Ifx=0)
{
Cout << "x is zero\n";
}
Else
{
Cout << "x is not zero\n";
}

A) x is zero
B) x is not zero
C) unable to determine
D) x is 1

Question 50

Given the following code fragment and the input value of 2.0, what output is generated?
Float tax;
Float total;
Cout << "enter the cost of the item\n";
Cin >> total;
If total >= 3.0)
{
Tax = 0.10;
Cout << total + total * tax) << endl;
}
Else
{
Cout << total << endl;
}

A) 2.2
B) 2.0
C) 3.1
D) 4.4

Question 51

What is the final value of x after the following fragment of code executes?
Int x=0;
Do
{
X++;
}whilex > 0);

A) 8
B) 9
C) 10
D) 11
E) infinite loop.

Question 52

Given the following code fragment, what is the final value of y?
Int x, y;
X = -1;
Y = 0;
Whilex <= 3)
{
Y += 2;
X += 1;
}

A) 2
B) 10
C) 6
D) 8

Question 53

Executing one or more statements one or more times is known as:

A) selection
B) iteration
C) sequence
D) algorithm

Question 54

What is the output of the following code fragment?
Int x=0;
While x < 5)
Cout << x << endl;
X ++;
Cout << x << endl;

A) 0
B) 5
C) 4
D) unable to determine

Question 55

Given the following code fragment, which of the following expressions is always true?
Int x;
Cin >> x;

A) if x < 3)
B) if x==1)
C) if x / 3) >1 )
D) if x = 1)

Question 56

Given the following code fragment and the input value of 4.0, what output is generated?
Float tax;
Float total;
Cout << "enter the cost of the item\n";
Cin >> total;
If total >= 3.0)
{
Tax = 0.10;
Cout << total + total * tax) << endl;
}
Else
{
Cout << total << endl;
}

A) 3
B) 3.3
C) 4.0
D) 4.4

Question 57

What is the advantage of the C++11 integer data types over the old data types?

A) Number of bits allocated changes dynamically as needed
B) No advantage, just new names
C) Specifies exact size in bits
D) Higher precision