Chapter 5

Question 1

How many times will the following code print “Welcome to Java”?
int count = 0;
while (count++ < 10) {
System.out.println(“Welcome to Java”);
}

Answer 1

10

Question 2

To add 0.01 + 0.02 + … + 1.00, what order should you use to add the numbers to get better accuracy?

Answer 2

add 0.01, 0.02, …, 1.00 in this order to a sum variable whose initial value is 0.

Question 3

Which of the following loops prints “Welcome to Java” 10 times?
A:
for (int count = 1; count <= 10; count++) {
System.out.println(“Welcome to Java”);
}
B:
for (int count = 0; count < 10; count++) {
System.out.println(“Welcome to Java”);
}
C:
for (int count = 1; count < 10; count++) {
System.out.println(“Welcome to Java”);
}
D:
for (int count = 0; count <= 10; count++) {
System.out.println(“Welcome to Java”);
}

Answer 3

AB

Question 4

Do the following two statements in (I) and (II) result in the same value in sum?
(I):
for (int i = 0; i < 10; ++i) {
     sum += i;
}

(II):
for (int i = 0; i < 10; i++) {
sum += i;
}

Answer 4

Yes

Question 5

Is the following loop correct?

for ( ; ; );

Answer 5

Yes

Question 6

What is the output for y?
int y = 0;
for (int i = 0; i < 10; ++i) {
     y += i;
}
System.out.println(y);

Answer 6

45

Question 7

How many times will the following code print “Welcome to Java”?
int count = 0;
do {
System.out.println(“Welcome to Java”);
} while (count++ < 10);

Answer 7

11

Question 8

How many times will the following code print “Welcome to Java”?
int count = 0;
do {
System.out.println(“Welcome to Java”);
count++;
} while (count < 10);

Answer 8

10

Question 9

What is the value in count after the following loop is executed?
int count = 0;
do {
System.out.println(“Welcome to Java”);
} while (count++ < 9);
System.out.println(count);

Answer 9

10

Question 10

The following loop displays _______________.

for (int i = 1; i <= 10; i++) {
System.out.print(i + “ “);
i++;
}

Answer 10

1 3 5 7 9

Question 11

How many times is the println statement executed?
for (int i = 0; i < 10; i++)
for (int j = 0; j < i; j++)
System.out.println(i * j)

Answer 11

45

Question 12

How many times will the following code print “Welcome to Java”?
int count = 0;
do {
System.out.println(“Welcome to Java”);
} while (++count < 10);

Answer 12

10

Question 13

What is the number of iterations in the following loop?
for (int i = 1; i < n; i++) {
     // iteration
}

Answer 13

n - 1

Question 14

How many times will the following code print “Welcome to Java”?
int count = 0;
while (count < 10) {
System.out.println(“Welcome to Java”);
count++;
}

Answer 14

10

Question 15

What is the output of the following code?
int x = 0;
while (x < 4) {
     x = x + 1;
}
System.out.println("x is " + x);

Answer 15

x is 4

Question 16

What will be displayed when the following code is executed?
int number = 6;
while (number > 0) {
     number -= 3;
     System.out.print(number + " ");
}

Answer 16

3 0

Question 17

What is y after the following for loop statement is executed?
int y = 0;
for (int i = 0; i < 10; ++i) {
     y += 1;
}

Answer 17

10

Question 18

What is the output after the following loop terminates?
int number = 25;
int i;
boolean isPrime = true;
for (i = 2; i < number; i++) {
     if (number % i == 0) {
          isPrime = false;
          break;
     }
}
System.out.println("i is " + i + " isPrime is " + isPrime)

Answer 18

i is 5 isPrime is false

Question 19

How many times is the println statement executed?
for (int i = 0; i < 10; i++)
for (int j = 0; j < 10; j++)
System.out.println(i * j);

Answer 19

100

Question 20

What is the value of balance after the following code is executed?
int balance = 10;
while (balance >= 1) {
     if (balance < 9)
          break;
     balance = balance - 9;
}

Answer 20

1