Question

**MEDAL + FAN**
Please check my Java Programming answers! I need help!

Answer 1

ello.

Answer 2

@woodrow73 Hii, haha.

Answer 3

you know a method header looks like: public static int returnAddition(int A)



and this is the body of a method:
{
int B = 2;
int sum = A + B;
return sum;
}

Answer 4

A few things should be noted here...
-A method header can be considered a only part of (using the example above) public static int returnAddition (int ) and the signature is the other part.

-You should review what data types can and cannot be returned.

-Also review how static methods are actually called and used in the main method. For example, if I called int sqrt(2); you need to realize that no piece of memory was actually allocated on the stack and accordingly nothing will be stored (in truth your compiler should complain). However, interestingly enough you can call a method that returns something and immediately print it without declaring a variable.

- Typically one does not name a parameter a number. For example double 25 is not correct.

-Review the difference between pass by value and pass by reference in order to determine the correct answer.

- Lastly, the arguments for function/methods should be separated by a comma and their data types explicitly declared. For example, (int a , int b).

Hopefully this helps and sorry for the long post.

Answer 5

so the body of a method is called that method's 'signature'?

Answer 6

hmmm that was terribly worded by me in fact I am kinda embarrassed that I didn't double check that because if misread it might lead to a incorrect interpretation. However, let me rephrase it, A method signature is part of the method header where as the method header is a section in the method. What you/@woodrow73 explicitly stated is indeed the method header but I wanted to point out that that these elements are sections or subsection to a larger concept.

Answer 7

ya, I just recently started learning about methods. To my knowledge you have the method modifiers(inside the method header) ie: public static
the return type: primitive data or void(not sure about the list of what's valid), and the parameters which are inside the parenthesis(int A, int B) {
if you would, which part of it is the signature?

Answer 8

@pipsy

Answer 9

For return types typically speaking they will be a primitive type, void, or a reference to some item/object. However, in java you don't really work with pointers and all that fun stuff but if you have the time I would suggest learning about that as it will given you an idea of what is happening on a low level. As for the signature there are different definitions for a signature but generally speaking it is referring to the method name and the number and type of its parameters. For example, returnAddition(int a) is the signature for the above example.

Answer 10

thanks

Answer 11

For number 3, based on what I've learned (it seems to be different depending on course) but the way my course runs a class that will not return any value, we use void

Answer 12

@pipsy Thanks for you help, but I'm not sure which problems a missed. Can you tell me which ones I answered incorrectly so I can look them over?

Answer 13

@Lyrae Can you help me? It's more Java Programming stuff...

Answer 14

I may be able to help aswell

Answer 15

@blahblah212121 That would be great! I'm drowning in this class and I'd really like to figure it out.

Answer 16

Yeah im taking AP comp sci just ask

Answer 17

Alright! Well, for instance, can you tell me which questions I answered incorrectly in the images I posted?

Answer 18

1, 3, 5, 6, 7, 8, 9 (unchecked), 10 need some review.

Answer 19

Oh man, I really bombed this one. UUUgh.

Answer 20

1.) Statements?

Answer 21

Yeah

Answer 22

3.) Void?

Answer 23

yup

Answer 24

Read pipsy and woodrows73 conversation above. They answer atleast half of your questions.

Also read some short tutorial on java methods and you'll fix all of them in a heartbeat
http://www.tutorialspoint.com/java/java_methods.htm for example

Answer 25

Thanks for your help :D

Answer 26

#5 is confusing me a bit.
Is 5.) int max(5, 3) = result;?

Answer 27

Naah, how would you assign a regular integer to variable; 5 for example?

Answer 28

So perhaps int result = max (5, 3);

Answer 29

yeah :)

Answer 30

Right on! :)
Another hard question.
6.) int result = min (2, 9);

Answer 31

and
7.) public static double sqrt(double num)

Answer 32

7 is correct, 6 is not.

Answer 33

8.) public static int sum (int a, int b)
Alright, I'll have another look at 6.

Answer 34

In 6 you should print the value

Answer 35

8 is correct!

Answer 36

6.) System.out.println(min(2), min(9));

Answer 37

Nope

Answer 38

Now you're guessing :P

Answer 39

System.out.println() is a method that prints something

Answer 40

You know, I had a feeling it was System.out.println(min(2, 9)); to be honest XD

Answer 41

Haha that's better!

Answer 42

Thanks for helping me with this, again :)
Two more questions left.

Answer 43

Np :)

Answer 44

Well, for #9, I know that a pass-by-value is copied into a location being used to hold the formal parameter's value during method/function execution. I'm not sure which option best fits the definition.
Maybe 9.) C?

Answer 45

Also,
10.) public static void print ( String word; count)

Answer 46

9 yes, 10 no

Answer 47

Oh wait wait wait.
10.) I just noticed that B had a comma rather then a semicolon. So it's B, (String word, int count)

Answer 48

Thank you so much, Lyrae! :) Coming to the rescue, once again.

Answer 49

Yes

Answer 50

Aah np :)

Answer 51

Did you get 10/10 this time? :P

Answer 52

I did! With your help, of course :D

Answer 53

Sweet! Haha all I do is bashing your work :P You're the one answering the questions ;)

Answer 54

What?? My grade wouldn't be as good as it is without your help, lol. I've tried asking the teacher for help, too. He always says something like "Go back in the book." or "Search for the tutorials on YouTube." He's not very helpful, haha.

Answer 55

Haha thx :) I recognice that rhetoric, it's probably a trait all programing teachers share :P

Answer 56

Maybe! I do online school though, and some of my teachers refrain me to the textbook for everything.

Answer 57

That's interesting; isn't a theachers job to teach? O well, one could debate this topic for hours.

Anyway, if you have other questions regaring CS/programming I'll be happy to help :) that's why I'm here after all!

Answer 58

Thanks again!