Consider the classes below:

public class TestA

{

public static void main (String args[])

{

int x = 2;

int y = 20

int counter = 0;

for (int j = y % x; j < 100; j + = (y / x))

counter++;

}

}

public class TestB

{ public static void main (String args[]) { int counter = 0; for (int j = 10; j > 0; - -j) + +counter; }}

Which of the following statements is true? a. The value of counter will be different at the end of each for loop for each class. b. The value of j will be the same for each loop for all iterationsc. Both (a) and (b) are true. d. Neither (a) nor (b) is true

Hi!

The correct answer is d. Neither (a) nor (b) is true.

Explanation:

First, you have to know what the scripts intend to do, and they are counting from 1 to 10 in both cases.

Table of results of class TestA at end of each iteration:

[j = 0, counter = 1]

[j = 10, counter = 2]

[j = 20, counter = 3]

[j = 30, counter = 4]

[j = 40, counter = 5]

[j = 50, counter = 6]

[j = 60, counter = 7]

[j = 70, counter = 8]

[j = 80, counter = 9]

[j = 90, counter = 10]

Table of results of class TestB at end of each iteration:

[j = 10, counter = 1]

[j = 9, counter = 2]

[j = 8, counter = 3]

[j = 7, counter = 4]

[j = 6, counter = 5]

[j = 5, counter = 6]

[j = 4, counter = 7]

[j = 3, counter = 8]

[j = 2, counter = 9]

[j = 1, counter = 10]

That's why a) and b) are false.

Maybe you want to know why using pre increments on class TestB doesn't affect the loop. The reason is that when enters in a loop, first checks the test condition and takes the decision if true or false, and last executes the incrementation step.