Java Test Help. Very little experience

Question

Ok, first off I am taking a Java test for my school's computer science team. I was just placed on the team because they needed an extra person, so my Java experience is close to 0. I would just like to know how to find out some of the answers and what some things mean in the following questions:
1: What is the Sum of 123(subscript16) and DEF(subscript16)
The answer is F12(sub16).
What I need to know about this is how 123 and DEF = F12.
2. Here is the code:
int accum = 0;
for(int i = 1; i <= 25; i++)
accum = accum + 1;
System.out.print ( sub ) ;
The answer is 25. What do these terms mean like accum and i++? How would you get this answer?
3. They are asking what the output would be. Here is the code:
double b = 1.5;
b = b * 2 + 5 / 2;
System.out.println ( b ) ;
The answer is 5.0 What does double b mean and how would you find the answer to that?
4. They are asking for what the output would be. Here is the code:
boolean p = false;
boolean q = true;
System.out.print ( !p && !q ) ;
System.out.print ( " " ) ;
System.out.print ( ! (p && q) );
The answer is false true. I know that boolean has something to do with logic, but I do not understand this question.
Thanks a ton if you can help me. I'm just trying to know a couple of things so I can make a better score on the test. I know it would be easier if I learned step by step, but I am limited on time and any shortcuts and hints will be helpful.
Thanks.

Answer 1

schmidt1302 wrote:
2. Here is the code:
int accum = 0;
for(int i = 1; i <= 25; i++)
accum = accum + 1;
System.out.print ( sub ) ;
The answer is 25.No it's not. You must not have copied the problem correctly. Either that or it's a stupid trick question. sub hasn't been defined there.
Thanks a ton if you can help me. I'm just trying to know a couple of things so I can make a better score on the test. I know it would be easier if I learned step by step, but I am limited on time and any shortcuts and hints will be helpful.Well, it's OK to cheat then.
Just go learn step-by-step.