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scjp chapter 10 self test doubt

pooja sharma
Greenhorn

Joined: Oct 24, 2007
Posts: 14
import static java.lang.System.*;
class _ {
static public void main(String... __A_V_) {
String $ = "";
for(int x=0; ++x < __A_V_.length; )
$ += __A_V_[x];
out.println($);
}
}
And the command line:
java _ - A .

What is the result?
A. -A
B. A.
C. -A.
D. -A.
E. _-A.
F. Compilation fails.
G. An exception is thrown at runtime.

Answer is b.

please explain how this answer is coming.
sridhar row
Ranch Hand

Joined: Jan 16, 2008
Posts: 162
for(int x=0; ++x < __A_V_.length; )
$ += __A_V_[x];

__A_V_.length = 2, __A_V_.length[0] = - and __A_V_.length[1] = A

1st iteration x = 1, 1 < 2 therefore $ = __A_V_[1] which is A next iteration x =2, 2 < 2 fails and therefore it prints A.
Vierda Mila
Ranch Hand

Joined: Feb 25, 2008
Posts: 61

__A_V_.length = 2, __A_V_.length[0] = - and __A_V_.length[1] = A


Hi Sridhar,

I think _A_V_.length = 3
__A_V[0] = -
__A_V[1] = A
__A_V[2] = .

and after iteration it will give output A.
[ April 29, 2008: Message edited by: Vierda Mila ]

SCJP 5
sridhar row
Ranch Hand

Joined: Jan 16, 2008
Posts: 162
you are right Vierda..i still haven't got my new pair of glasses.
pooja sharma
Greenhorn

Joined: Oct 24, 2007
Posts: 14
Practically I had calculated the length of the __A_V_ and it is coming 3 so vierda's answer is more appropriate.
thanks for showing me the result step by step
Mark Moge
Ranch Hand

Joined: Mar 14, 2009
Posts: 100

if the command line looks like
java _ - A .
_ is the name of class
then
__A_V[0] = -
__A_V[1] = A
__A_V[2] = .
so __A_V.length==3
and output should be A.

How can i delete my post? Now i can see where i was wrong so i don't have question ...




SCJP6 | http://programmerutilities.blogspot.com/
rohan yadav
Ranch Hand

Joined: Oct 13, 2009
Posts: 156
You dont need to delete your post, so that other can learn from it


Sage of The Monstrous Toad of Mount Myoboku
 
It is sorta covered in the JavaRanch Style Guide.
 
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