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Returning a value of type int in the for loop will satisfy the type requirement because type int will be automatically converted to type double as it is returned. (Conversion from type int to type double is a widening conversion.)

Back to Question 14

Answer 13

A. Compiler Error

Explanation 13

The scope of a local variable

In general, the scope of a local variable extends from the point at which it is declared to the curly brace that signals the end of the block in which it isdeclared.

This applies to for loop in an interesting way

While it is allowable to declare a variable within the first clause of a for loop, the scope of that variable is limited to the block of code contained in the loop structure.

The variable cannot be accessed outside the loop.

Attempts to access variable out of scope

This program attempts to access the value of the variable named cnt after the loop terminates.

The program displays the following compiler error under JDK 1.3. This error results from the attempt to display the value of the counter after theloop terminates.

Ap037.java:15: cannot resolve symbol symbol : variable cntlocation: class Worker System.out.println(cnt + " ");

Back to Question 13

Answer 12

C. 0 1 2 3 4 5

Explanation 12

A simple for loop structure

This program illustrates a simple for loop that displays the value of its counter using a call to the print method inside the loop.

After the loop terminates, the program displays the value of the counter one last time using a call to println .

Three clauses separated by semicolons

The first line of a for loop structure always contains three clauses separated by semicolons.

The first and third clauses may be empty, but the semicolons are required in any case.

The first clause ...

The first clause is executed once and only once at the beginning of the loop.

It can contain just about any valid Java expression.

It can even contain more than one expression with the individual expression separated by commas.

When the first clause contains more than one expression separated by commas, the expressions are evaluated in left-to-right order.

The second clause

The second clause is a conditional clause. It must contain an expression that returns a boolean value.

(Actually, this clause can also be empty, in which case it is apparently assumed to be true. This leads to an infinite loop unless there is somecode inside the loop to terminate it, perhaps by executing a return or a break statement.)

An entry-condition loop

The for loop is an entry condition loop, meaning that the conditional expression is evaluated once immediately after the first clause isexecuted, and once per iteration thereafter.

Behavior of the for loop

If the conditional expression returns true, the block of code following the closing parenthesis is executed.

If it returns false, the block of code is skipped, and control passes to the first executable statement following the block of code.

(For the case where the block contains only one statement, the matching curly brackets can be omitted.)

The third clause

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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