Java Reference
In-Depth Information
figure 3-11
In the first line, you start by initializing the
loopCounter
to
0
. Then the
for
loop's test condition,
loopCounter <= 2
, is checked. If this condition is
true
, the loop executes for the first time. After the
code inside the curly braces has executed, the incrementing part of the
for
loop,
loopCounter++
, will
be executed, and then the test condition will be re‐evaluated. If it's still
true
, another execution of the
loop code is performed. This continues until the
for
loop's test condition evaluates to
false
, at which
point looping will end, and the first statement after the closing curly brace will be executed.
The code inside the curly braces is the equation you saw in earlier examples, only this time you are
placing its result into the
degCent
array, with the index being the value of
loopCounter
.
In the second
for
loop, you write the results contained in the
degCent
array to the screen:
for (loopCounter = 2; loopCounter >= 0; loopCounter
−−
) {
document.write("Value " + loopCounter +
" was " + degFahren[loopCounter] +
" degrees Fahrenheit");
document.write(" which is " + degCent[loopCounter] +
" degrees centigrade<br />");
}
This time you're counting
down
from
2
to
0
. The variable
loopCounter
is initialized to
2
, and the loop
condition remains
true
until
loopCounter
is less than
0
. This time
loopCounter
is actually decremented
each time rather than incremented, by means of
loopCounter
−−
. Again,
loopCounter
is serving a dual
purpose: It keeps count of how many loops you have done and also provides the index position in the array.
Note
In these examples, you've used whole numbers in your loops. However,
there is no reason why you can't use fractional numbers, although it's much
less common to do so.
