The following code has some error(s). Rewrite the correct code and underlining all the corrections made.

integer counter = 0; 
i = 10; num;
for (num = i; num >= 1; num--);
{
    If i % num = 0
    {
        counter = counter + 1;
    }
}

Rewrite the following program segment using while instead of for loop.

int f = 1, i; 
for(i = 1; i <= 5 ; i++)
{
    f *= i; 
    System.out.println(f);
}

Give the output of the following expression, when a = 6.

a += ++a + a++ + a-- + a-- + --a + ++a