Ch.2

Question 1

What is the value of x after the following statements?

x= 0

x += 3.0*4.0

x -= 2.0

Answer 1

10.0

Question 2

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; }

Answer 2

2.0

Question 3

Given the following code fragment, which of the following expressions is always true?

int x;

cin >> x;

A) if( x = 1)

B) if( x == 1)

C) if((x/3) > 1)

D) if( x < 3)

Answer 3

if( x = 1)

Question 4

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;

}

Answer 4

4.4

Question 5

What is the value of x after the following statements?

int x;

x = x + 30;

Answer 5

garbage

Question 6

What is the value of x after the following statements?

int x, y, z;

y = 10;

z = 3;

x = y * z + 3;

Answer 6

33

Question 7

Which of the following is a valid identifier?

A) three_com

B) 3_com

C) 3com

D) 3-com

E) dollar$

Answer 7

three_com

Question 8

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

Answer 8

iteration

Question 9

Another way to write the value 3452211903 is

Answer 9

3.452211903e09

Question 10

Given the following code fragment, what is the final value of y?

int x, y;

x = -1;

y = 0;

while(x <= 3)

{

y += 2;

x += 1;

}

Answer 10

8

Question 11

Which of the following statements is NOT legal?

A) char ch = ‘b’;

B) char ch = ‘0’;

C) char ch = “cc”;

D) char ch = 65;

Answer 11

char ch = “cc”;

Question 12

What is the output of the following code fragment?

int x = 0;

while( x < 5)

cout ≤≤ x ≤≤ endl;

x ++;

cout ≤≤ x ≤≤ endl;

Answer 12

5

Question 13

What is the output of the following code?

cout << “This is a \” << endl;

Answer 13

Nothing, it is a syntax error.

Question 14

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))

Answer 14

((y < x) && (x < z))

Question 15

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 >> endl;

D) cin << myFloat;

Answer 15

cin >> myFloat;

Question 16

What is the output of the following code?

float value;

value = 33.5;

cout << value << endl;

Answer 16

33.5

Question 17

What is the output of the following code?

float value;

value = 33.5;

cout ≤≤ “value” ≤≤ endl;

Answer 17

value

Question 18

What is the value of x after the following statements?

int x;

x = 0;

x = x + 30;

Answer 18

30

Question 19

Which of the following is not a valid identifer?

A) myInt

B) return

C) total3

D) myInteger

Answer 19

return

Question 20

What is the value of x after the following statements?

int x;

x = 15/4;

Answer 20

3.0

Question 21

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

Answer 21

(x >19 && x < 99)

Question 22

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

Answer 22

(x >=20 || x <= 12)

Question 23

The stream that is used for input from the keyboard is

Answer 23

cin >>

Question 24

≤≤ is called the ________ operator

Answer 24

insertion

Question 25

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

Answer 25

iteration

Question 26

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

Answer 26

do-while

Question 27

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

Answer 27

When there are multiple statements in the body.

Question 28

>> is known as the ________ operator.

Answer 28

extraction

Question 29

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

Answer 29

nested statements

Question 30

int myValue; is called a

Answer 30

variable declaration

Question 31

Variable names may begin with a number.

Answer 31

false

Question 32

The integer 0 is considered true.

Answer 32

false

Question 33

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

Answer 33

true

Question 34

The opposite of less than is greater than.

Answer 34

false

Question 35

The body of a while loop may never execute

Answer 35

true

Question 36

Every line in a program should have a comment.

Answer 36

false

Question 37

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)

Answer 37

false

Question 38

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

Answer 38

false