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return statement

Jim Colwood
Greenhorn

Joined: Jul 10, 2007
Posts: 10
Hi all,

any idea why this would return "Sum = 15" and not "Sum = 1"?



couldn't find a similar thread with my brief search in the forum.
Thanks.


SCJP 6 |
W. Joe Smith
Ranch Hand

Joined: Feb 10, 2009
Posts: 710
I was wrong, so I deleted this post. Don't want false information floating out there confusing everyone! See below post for correct answer.


SCJA
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Ruben Soto
Ranch Hand

Joined: Dec 16, 2008
Posts: 1032
Calculate calls itself recursively, so:
Calculate(5) = Calculate(4) + 5
= Calculate(3) + 4 + 5
= Calculate(2) + 3 + 4 + 5
= Calculate(1) + 2 + 3 + 4 + 5
= 1 + 2 + 3 + 4 + 5
= 15


All code in my posts, unless a source is explicitly mentioned, is my own.
Devaka Cooray
ExamLab Creator
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Joined: Jul 29, 2008
Posts: 2891
    
  19

Good question. Please QuoteYourSources.


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Jim Colwood
Greenhorn

Joined: Jul 10, 2007
Posts: 10
Thanks for your replies guys.

Yes Joe, I had my doubts about your reply. so I added couple of lines in the code to see what's going on at runtime.



Ruban, your calculation is right. but the real question i have is, even if the FIRST return statement returns the int, why is the returned value 15?

I had a question with similar logic in a Java test offered to me by a recruiter.
Thanks again.
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18139
    
  39

Ruban, your calculation is right. but the real question i have is, even if the FIRST return statement returns the int, why is the returned value 15?


The FIRST return statement did return an int, but not to the main() method -- it returned it back to the calculate() method, which called it. If the main() method had triggered the FIRST return statement, then it would have printed 1.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Jim Colwood
Greenhorn

Joined: Jul 10, 2007
Posts: 10
Duh! it seems simple after you explained it, but it's easy to miss it.

Thanks a lot Henry.
 
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