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binary search

hari harann
Ranch Hand

Joined: Aug 07, 2008
Posts: 54
Given a properly prepared String array containing five elements, which range of results could a
proper invocation of Arrays.binarySearch() produce?
A. 0 through 4
B. 0 through 5
C. -1 through 4
D. -1 through 5
E. -5 through 4
F. -5 through 5
G. -6 through 4
H. -6 through 5
Answer:
3 G is correct. If a match is found, binarySearch()will return the index of the element that was matched. If no match is found, binarySearch() will return a negative number that,
if inverted and then decremented, gives you the insertion point (array index) at which the value searched on should be inserted into the array to maintain a proper sort.
but i feel option G is incorrect, the answer is option E. am i right??
Pranav Bhatt
Ranch Hand

Joined: Mar 20, 2006
Posts: 284
Hi Hari,
The range will be from -6 through 4 As the array is of 5 elements so if you insert any element that comes at last like ZZZ. This will give you -6 as it will come after the last 5th element. If you happen to insert the fifth element to get the highest range value you will end up with 4 as elements are from 0->4(5 elements). Check the below prog-:
hari harann
Ranch Hand

Joined: Aug 07, 2008
Posts: 54
Thanks pranav
Ankit Garg
Sheriff

Joined: Aug 03, 2008
Posts: 9303
    
  17

Hey Pravan I modified your code. I think this will make it more understandable.



SCJP 6 | SCWCD 5 | Javaranch SCJP FAQ | SCWCD Links
Pranav Bhatt
Ranch Hand

Joined: Mar 20, 2006
Posts: 284
Hey Ankit, Its Pranav . Thanks for the modification, am bit lazy here
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: binary search