Question

JAVA

What is the output? Explain how you obtain this answer by hand, not using a computer. String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; for(int i = 1; i <= 26; i *= 2) { System.out.print(alphabet.charAt(i - 1)); }

What is the output? Explain how you obtain this answer by hand, not using a computer. int n = 500; int count = 0; while (n > 1) { if (n % 2 == 0) { n /= 3; } else { n /= 2; } count++; } System.out.println(count);

A Java Swing application contains this paintComponent method for a panel. Sketch what is drawn by this method. public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.black); g.fillRect(100, 100, 200, 100); g.fillRect(300, 200, 200, 100); g.fillRect(500, 100, 200, 100); }

Answer 1

Part 1) Since i is iterating in powers of 2. So, we will get alphabet[1-1], alphabet[2-1], alphabet[2*2-1],alphabet[2*2*2-1],alphabet[2*2*2*2-1], which is alphabet[0], alphabet[1], alphabet[3], alphabet[7], alphabet[15] as i is limited to the value 26 and since we are using System.out.print; therefore result will be displayed in one single line. So, output will be ABDHP.

Part 2) Initially count is 0. Since, 500%2 == 0, now n becomes 500/3 = 166 and count is incremented and becomes 1. Since n>1, loop execution will continue.

Now, since, 166%2 == 0, now n becomes 166/3 = 55 and count is incremented and becomes 2. Since n>1, loop execution will continue.

Since, 55%2 != 0, now n becomes 55/2 = 27 and count is incremented and becomes 3. Since n>1, loop execution will continue.

Since, 27%2 != 0, now n becomes 27/2 = 13 and count is incremented and becomes 4. Since n>1, loop execution will continue.

Since, 13%2 != 0, now n becomes 13/2 = 6 and count is incremented and becomes 5. Since n>1, loop execution will continue.

Since, 6%2 == 0, now n becomes 6/3 = 2 and count is incremented and becomes 6. Since n>1, loop execution will continue.

Since, 2%2 == 0, now n becomes 2/3 = 0 and count is incremented and becomes 7. Since, n is not greater than 1 therefore while loop terminates here.

So, output will be 7.

Part 3) You need to paste the code and see the output yourself.

Hope it helps, do give your response.