QUIZ 2

Question 1

int limit;
int reps =0;
cin»limit;

while (reps <limit)
{
cin&raquo_space; entry;
triple = entry*3;
cout &laquo_space;triple;
reps++;
}
cout«endl;

This code is an example of a(n) ________ while loop.

Answer 1

counter-controlled

Question 2

Putting in front of a logical expression reverses the value of that logical expression

Answer 2

!

Question 3

Which of the following will causes a logical error if you are attempting to compare x to 5?

if (x==5)
if(x=5)
if(x>=5)
if(x<=5)

Answer 3

if(x=5)

Question 4

Suppose sum and num are int variables, the input is 18 25 61 6 -1. What is the output of the following code?
Sum =0
Cin» num;
While (num != -1)
{
Sum = sum + num;
Cin»num;
}
Cout«sum«endl;

Answer 4

110

Question 5

Assume you have three int variable: x =2 , y=6, and z. Choose the value of z in the following expression: z(y/x>0) ? x:y;

Answer 5

2

Question 6

What is the output of the following C++ code?

Int x =55;
Int y = 5;

Switch (x%7)
{
Case 0;
Case 1;
Y++;
Case 2:
Case 3:
Y=y+2;
Case 5:
Case 6:
Y=y-3;
}
Cout«y«endl;

Answer 6

2

Question 7

What is the output of the following C++ code?
num=10;
while (num>10)
num=num-2;
cout &laquo_space;num &laquo_space;endl;

Answer 7

10

Question 8

Consider the following code.
Int limit
Int reps =0;

Cin&raquo_space; limit

While (reps < limit)
{
Cin»entry;
Triple=entry*3;
Cout«triple;
Cout«triple;
Reps++;
}
Cout«endl;

This code is an example of a(n) _________ while loop.

Answer 8

Counter-controlled

Question 9

In C++, the operators != and == have the same order of precedence.

Answer 9

True

Question 10

Suppose x and is 5 and y is 7. Choose the value of the following expression:
(x != 7) && (x <= y)

Answer 10

True

Question 11

When one control statement is located within another, it is said to be

Answer 11

nested

Question 12

Which of the following statements generates a random number between 0 and 50?

Answer 12

srand(time(0));
num = rand() % 50;

Question 13

A(n) ______-controlled while loop uses a bool variable to control the loop.

Answer 13

flag

Question 14

Which of the following is a repetition structure in C++?
while…do
if
switch
do…while

Answer 14

do…while

Question 15

A loop that continues to execute endlessly is called a(n) _______ loop.

Answer 15

infinite

Question 16

Which of the following expressons correctly determines that x is greater than 10 and less than 20?

Answer 16

10<x && x<20

Question 17

To generate a random number, you can use the function rand of the header file

Answer 17

cstdlib

Question 18

What is the initial statement in the following for loop?
int i;
for (i=1; i<20; i++)
cout«”hello world”;
cout«”!” &laquo_space;endl;

Answer 18

i=1

Question 19

Which of the following is relational operator?

Answer 19

==

Question 20

Consider the following statemnets.

Int score;
String grade;

If (score >= 65)
Grade = “pass”;
Else
Grade = “fail”;

If score is equal to 75, the value of grade is

Answer 20

pass

Question 21

Suppose sum, num, and j are int variables, and the input is 4 7 12 9 -1. What is the output of the following code?
cin » sum;
cin » num;
for (j = 1; j <= 3; j++) { cin » num; sum = sum + num; }
cout « sum « endl;

Answer 21

24

Question 22

The control statements in the for loop include the initial statement, loop condition, and update statement.

Answer 22

true

Question 23

Assume that all variables are properly declared. The following for loop executes 20 times.
for (i=0; i <= 20, i++)
cout &laquo_space;1;

Answer 23

false

Question 24

You can use either a(n) _________ to store the value of a logical expression.

Answer 24

an int variable or a bool variable

Question 25

In a ____ control structure, the compute executes particular statements depending on some condition

Answer 25

Selection

Question 26

In a switch statement, if the value of the expression does not match any of the case values, the statements following ____ label execute.

Answer 26

default

Question 27

Suppose that x is an int variable. Which of the following expression always evaluates to true?

Answer 27

(x > 0) I I (x <= 0)

Question 28

The value of the expression 6 < 5 || ‘g’ > ‘a’ && 7 < 4
is

Answer 28

false

Question 29

What is the value of x after the following statements execute?

Int x;
X = (5 <= 3 && ‘A’ < ‘F’) ? 3 : 4

Answer 29

4

Question 30

What is the output of the following C++ code?

count = 1;
num = 25;
while (count < 25)
{
num = num - 1;
count++;
}
cout &laquo_space;count &laquo_space;” “ &laquo_space;num &laquo_space;endl;

Answer 30

25 1