Java - Chapter 5 Quiz

How many times will the following code print "Welcome to Java"? int count = 0; while (count < 10) { System.out.println("Welcome to Java"); count++; } A. 8 B. 9 C. 10 D. 11 E. 0

C

How many times will the following code print "Welcome to Java"? int count = 0; while (count++ < 10) { System.out.println("Welcome to Java"); } A. 8 B. 9 C. 10 D. 11 E. 0

C

What is the number of iterations in the following loop? for (int i = 1; i < n; i++) { // iteration } A. 2*n B. n C. n - 1 D. n + 1

C

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); A. 8 B. 9 C. 10 D. 11 E. 0

C

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; } A. -1 B. 0 C. 1 D. 2

C

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

C

Analyze the following code: public class Test { public static void main (String args[]) { int i = 0; for (i = 0; i < 10; i++); System.out.println(i + 4); } } A. The program has a compile error because of the semicolon (;) on the for loop line. B. The program compiles despite the semicolon (;) on the for loop line, and displays 4. C. The program compiles despite the semicolon (;) on the for loop line, and displays 14. D. The for loop in this program is same as for (i = 0; i < 10; i++) { }; System.out.println(i + 4);

C and D

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); A. 8 B. 9 C. 10 D. 11 E. 0

C

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; } A. Yes B. No

A

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); A. 100 B. 20 C. 10 D. 45

A

Is the following loop correct? for ( ; ; ); A. Yes B. No

A

To add 0.01 + 0.02 + ... + 1.00, what order should you use to add the numbers to get better accuracy? A. add 0.01, 0.02, ..., 1.00 in this order to a sum variable whose initial value is 0. B. add 1.00, 0.99, 0.98, ..., 0.02, 0.01 in this order to a sum variable whose initial value is 0.

A

What is sum after the following loop terminates? int sum = 0; int item = 0; do { item++; if (sum >= 4) continue; sum += item; } while (item < 5); A. 6 B. 7 C. 8 D. 9 E. 10

A

Will the following program terminate? int balance = 10; while (true) { if (balance < 9) break; balance = balance - 9; } A. Yes B. No

A

Analyze the following code. int count = 0; while (count < 100) { // Point A System.out.println("Welcome to Java!"); count++; // Point B } // Point C A. count < 100 is always true at Point A B. count < 100 is always true at Point B C. count < 100 is always false at Point B D. count < 100 is always true at Point C E. count < 100 is always false at Point C

A and E

How many times will the following code print "Welcome to Java"? int count = 0; do { System.out.println("Welcome to Java"); } while (++count < 10); A. 8 B. 9 C. 10 D. 11 E. 0

C

What is sum after the following loop terminates? int sum = 0; int item = 0; do { item++; sum += item; if (sum > 4) break; } while (item < 5); A. 5 B. 6 C. 7 D. 8 E. 9

B

What is the number of iterations in the following loop? for (int i = 1; i <= n; i++) { // iteration } A. 2*n B. n C. n - 1 D. n + 1

B

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); A. i is 5 isPrime is true B. i is 5 isPrime is false C. i is 6 isPrime is true D. i is 6 isPrime is false

B

What is y after the following for loop statement is executed? int y = 0; for (int i = 0; i < 10; ++i) { y += 1; } A. 9 B. 10 C. 11 D. 12

B

Will the following program terminate? int balance = 10; while (true) { if (balance < 9) continue; balance = balance - 9; } A. Yes B. No

B

Analyze the following code: import java.util.Scanner; public class Test { public static void main(String[] args) { int sum = 0; for (int i = 0; i < 100000; i++) { Scanner input = new Scanner(System.in); sum += input.nextInt(); } } } A. The program does not compile because the Scanner input = new Scanner(System.in); statement is inside the loop. B. The program compiles, but does not run because the Scanner input = new Scanner(System.in); statement is inside the loop. C. The program compiles and runs, but it is not efficient and unnecessary to execute the Scanner input = new Scanner(System.in); statement inside the loop. You should move the statement before the loop. D. The program compiles, but does not run because there is not prompting message for entering the input

C

Analyze the following fragment: double sum = 0; double d = 0; while (d != 10.0) { d += 0.1; sum += sum + d; } A. The program does not compile because sum and d are declared double, but assigned with integer value 0. B. The program never stops because d is always 0.1 inside the loop. C. The program may not stop because of the phenomenon referred to as numerical inaccuracy for operating with floating-point numbers. D. After the loop, sum is 0 + 0.1 + 0.2 + 0.3 + ... + 1.9

C

Given the following four patterns, Pattern A Pattern B Pattern C Pattern D 1 1 2 3 4 5 6 1 1 2 3 4 5 6 1 2 1 2 3 4 5 2 1 1 2 3 4 5 1 2 3 1 2 3 4 3 2 1 1 2 3 4 1 2 3 4 1 2 3 4 3 2 1 1 2 3 1 2 3 4 5 1 2 5 4 3 2 1 1 2 1 2 3 4 5 6 1 6 5 4 3 2 1 1 Which of the pattern is produced by the following code? for (int i = 1; i <= 6; i++) { for (int j = 6; j >= 1; j--) System.out.print(j <= i ? j + " " : " " + " "); System.out.println(); } A. Pattern A B. Pattern B C. Pattern C D. Pattern D

C

Analyze the following code. double sum = 0; for (double d = 0; d < 10; sum += sum + d) { d += 0.1; } A. The program has a syntax error because the adjustment statement is incorrect in the for loop. B. The program has a syntax error because the control variable in the for loop cannot be of the double type. C. The program compiles but does not stop because d would always be less than 10. D. The program compiles and runs fine.

D

Analyze the following statement: double sum = 0; for (double d = 0; d < 10;) { d += 0.1; sum += sum + d; } A. The program has a compile error because the adjustment is missing in the for loop. B. The program has a compile error because the control variable in the for loop cannot be of the double type. C. The program runs in an infinite loop because d < 10 would always be true. D. The program compiles and runs fine.

D

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) A. 100 B. 20 C. 10 D. 45

D

How many times will the following code print "Welcome to Java"? int count = 0; do { System.out.println("Welcome to Java"); } while (count++ < 10); A. 8 B. 9 C. 10 D. 11 E. 0

D

Suppose the input for number is 9. What is the output from running the following program? import java.util.Scanner; public class Test { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter an integer: "); int number = input.nextInt(); int i; boolean isPrime = true; for (i = 2; i < number && isPrime; i++) { if (number % i == 0) { isPrime = false; } } System.out.println("i is " + i); if (isPrime) System.out.println(number + " is prime"); else System.out.println(number + " is not prime"); } } A. i is 3 followed by 9 is prime B. i is 3 followed by 9 is not prime C. i is 4 followed by 9 is prime D. i is 4 followed by 9 is not prime

D

The following loop displays _______________. for (int i = 1; i <= 10; i++) { System.out.print(i + " "); i++; } The correct answer is D. A. 1 2 3 4 5 6 7 8 9 B. 1 2 3 4 5 6 7 8 9 10 C. 1 2 3 4 5 D. 1 3 5 7 9 E. 2 4 6 8 10

D

What is i after the following for loop? int y = 0; for (int i = 0; i < 10; ++i) { y += i; } A. 9 B. 10 C. 11 D. undefined

D

What is the output after the following loop terminates? int number = 25; int i; boolean isPrime = true; for (i = 2; i < number && isPrime; i++) { if (number % i == 0) { isPrime = false; } } System.out.println("i is " + i + " isPrime is " + isPrime); A. i is 5 isPrime is true B. i is 5 isPrime is false C. i is 6 isPrime is true D. i is 6 isPrime is false

D

What balance after the following code is executed? int balance = 10; while (balance >= 1) { if (balance < 9) continue; balance = balance - 9; } A. -1 B. 0 C. 1 D. 2 E. The loop does not end

E

What is the output for y? int y = 0; for (int i = 0; i < 10; ++i) { y += i; } System.out.println(y); A. 10 B. 11 C. 12 D. 13 E. 45

E

What is the output of the following code? int x = 0; while (x < 4) { x = x + 1; } System.out.println("x is " + x); A. x is 0 B. x is 1 C. x is 2 D. x is 3 E. x is 4

E

Which of the following loops correctly computes 1/2 + 2/3 + 3/4 + ... + 99/100? A: double sum = 0; for (int i = 1; i <= 99; i++) { sum = i / (i + 1); } System.out.println("Sum is " + sum); B: double sum = 0; for (int i = 1; i < 99; i++) { sum += i / (i + 1); } System.out.println("Sum is " + sum); C: double sum = 0; for (int i = 1; i <= 99; i++) { sum += 1.0 * i / (i + 1); } System.out.println("Sum is " + sum); D: double sum = 0; for (int i = 1; i <= 99; i++) { sum += i / (i + 1.0); } System.out.println("Sum is " + sum); E: double sum = 0; for (int i = 1; i < 99; i++) { sum += i / (i + 1.0); } System.out.println("Sum is " + sum); A. BCD B. ABCD C. B D. CDE E. CD

E

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"); } A. BD B. ABC C. AC D. BC E. AB

E