Computer Applications

How many times will the following loop execute?

public static void main(String args[])
{
    int i = 1;
    while (i < 10)
        if (i++ % 2 == 0)
            System.out.println(i);
}

Java Iterative Stmts

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Answer

Loop executes 9 times

Reason — There is a misprint in the book. The loop executes 9 times. Value of i is printed 4 times inside the loop. The condition if (i++ % 2 == 0) will be false when i is odd and true when i is even. Value of i will be incremented after if check is performed due to post increment opertor i++. Execution of the loop is summarized in the table below:

Iterations	i	`i++ % 2 == 0`	Output	Remarks
1^st	1	False		Value of `i` becomes 2 after if check as `i++` increments it after the evaluation of `i++ % 2 == 0`
2^nd	2	True	3	`i` becomes 3 after if check, hence 3 is printed in this iteration.
3^rd	3	False		`i` becomes 4.
4^th	4	True	5	`i` becomes 5.
5^th	5	False		`i` becomes 6.
6^th	6	True	7	`i` becomes 7.
7^th	7	False		`i` becomes 8.
8^th	8	True	9	`i` becomes 9.
9^th	9	False		`i` becomes 10.

As value of i is now 10, the test condition of while loop becomes false hence, 10^th iteration of the loop is not executed.

Answered By

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What will be the output of the following code?

public static void main(String args[])
{
    int sum = 0;
    for (int i= 1; i <= 5; i++)
    {
        sum = i;
    }
    System.out.println(sum);
}

View Answer

How many times will the following loop execute?

public static void main(String args[])
{
    int sum = 0;
    for (int i = 10; i > 5; i++)
    {
        sum += i;
    }
    System.out.println(sum);
}

5
0
15
Infinite loop

View Answer

Computer Applications

How many times will the following loop execute?

Java Iterative Stmts

Answer

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