Java Reference
In-Depth Information
while
(
true
)
{
int
mid = (start + end) / 2;
if
(start == end)
{
if
(a [ end ] == number)
{
return
end ;
}
else
{
return
−
1;
}
if
(a[mid]
>
= number)
{
end = mid ;
}
else
{
start = mid + 1;
}
}
}
Note that the new code is missing the recursive return statements in the second part of
the code. Therefore, an
if
-
else
structure is now needed. Alternatively, the
return
state-
ment could have been substituted with a
continue
statement that goes back to the begin-
ning of the infinite
while
loop as shown below.
public static int
binarySearch(
int
start ,
int
end ,
int
number ,
int
[] a)
{
while
(
true
)
{
int
mid = (start + end) / 2;
if
(start == end)
{
if
(a [ end ] == number)
{
return
end ;
}
else
{
return
−
1;
}
if
(a[mid]
>
= number)
{
end = mid ;
continue
;
start = mid + 1;
}
}
14.4.2 Bubble Sort
Bubble sort
is the easiest type of sort. You can think of boiling water. As the water
boils, the lighter particles bubble to the top, while the heavier ones sink to the bottom. The
algorithm uses the same principle. Let us examine one pass of the algorithm. Consider the
following array.
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The first pass of the algorithm goes left to right. It compares a pair of numbers. If they
are in the wrong order, then the algorithm swaps them. For example, the algorithm will
first look at 10 and 5. They are in the wrong order and it will swap them.
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