2.5

y: 0, 4, 11, 19
x: 4, 7, 11, 8, 19, 0, 19

OUTPUT
x = 11
y = 4 
x = 19
y = 11
x = 19
y = 19


2.6:

num: 2
count: 1, 2, 4, 5, 6, 7

OUTPUT
hello
the count is 2
the count is 7

3.11:
int a=9; double b=0.5; int c=0;
a + 3 / a   => 9
25 / ((a-4)*b)  => 10.0
a / b * a  =>  18.0*9  => 162.0
a % 2 - 2 % a  =>  -1


4.2:
x: 2.1, 4.1, 6.1, 5.1, 7.1

OUTPUT
something else, x=2.1
case 4, x = 4
case 6, x=5.1
case 5, x=5.1
case 4, x=5.1

4.6:
for (int start=1; start <= 5; start+=2)
{	for (int count = start; count >=1; count--)
	{	System.out.print(count + " ");
	}
	System.out.println("liftoff");
}

start: 1, 3, 5, 7
count: 1, 0, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0

OUTPUT:
1 liftoff
3 2 1 liftoff
5 4 3 2 1 liftoff

11.6:
int a=10; int b=2; double x = 6.0;
a - 7 / (x - 4)  => a-7/2.0 => a-3.5 => 6.5
8+a*++b/20 => 8+a*3/20 => 8+30/20 => 8+1 => 9
a+b-- => 12  (b == 1)
a+(b=5)%9 => a+5%9 => a+5 => 15  (b==5)
a=x=-12   => compiler error

11.7:
String s="hi";
int num=3;
char ch='m';
s+(num+4) => s + 7 => hi7
s+num+4 => "hi3" + 4 => hi34
s+'!'+"\"" => "hi!" + "\"" => hi!"
num+ch => 3+unicode('m')...
'8' + 9 => unicode('8') + 9 ...