1. What is y after the following switch statement?

int x = 0;

int y = 0;

switch (x + 1) {

case 0: y = 0;

case 1: y = 1;

default: y = -1

}

2. Assume x is 0. What is the output of the following statement?

if (x > 0)

System.out.print("x is greater than 0");

else if (x < 0)

System.out.print("x is less than 0");

else

System.out.print("x equals 0");

3. Analyze the following two codes and indicate if the code is correct or there is a problem:

Code 1:

boolean even;

if (number % 2 == 0)

even = true;

else

even = false;

Code 2:

boolean even = (number % 2 == 0);

4. What is the output of the following switch statement?

char ch = 'a';

switch (ch) {

case 'a':

case 'A':

System.out.print(ch); break;

case 'b':

case 'B':

System.out.print(ch); break;

case 'c':

case 'C':

System.out.print(ch); break;

case 'd':

case 'D':

System.out.print(ch);

}

5. What is y after the following switch statement is executed?

x = 3;

switch (x + 3) {

case 6: y = 0;

case 7: y = 1;

default: y += 1;

}

6. Which of the following code displays the area of a circle if the radius is positive.

a. if (radius <= 0) System.out.println(radius * radius * 3.14159);

b. if (radius != 0) System.out.println(radius * radius * 3.14159);

c. if (radius >= 0) System.out.println(radius * radius * 3.14159);

d. if (radius > 0) System.out.println(radius * radius * 3.14159);

7. ) If you enter input 9, show the output of the following code:

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");

}

}