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Provide program code that illustrates some of what the student is expected to know about the increment/decrement operators. Also provides program code to illustrate some of what the student is apparently not expected to know.

Table of contents

Preface

General

This tutorial lesson is part of a series of lessons dedicated to the AP Computer Science A Exam .

The purpose of the series is to help you to better understand the Java Subset specifications for the Advanced Placement Computer Science A exam.

For example, if you access the AP Computer Science Course Description and scroll down to Appendix A titled AP Computer Science Java Subset , you will find the following specification :

3. The increment/decrement operators ++ and -- are part of the AP Java subset.

These operators are used only for their side effect, not for their value.

That is, the postfix form (for example, x++) is always used, and the operators are notused inside other expressions.

For example, a[x++] is not used.

(Note that I entered some line breaks into the above specification for clarity. Also note that this is the wording that appeared on the website on March 3,2011. It may change over time.)

May be clear to some, but not to others

While some students and their homeschool parents may know exactly what is meant by this specification, others may not. Therefore, my objective will be to elaborateon and attempt to clarify the specification from a technical viewpoint to help those students and their parents get a better understanding of where they need toconcentrate their efforts.

In this lesson, I will provide program code that illustrates some of what the student is expected to know. I will also provide program code to illustrate whatthe student is apparently not expected to know.

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the figuresand listings while you are reading about them.

Figures

  • Figure 1 . Behavior of increment operator.
  • Figure 2 . Behavior of decrement operator.

Listings

Supplemental material

I recommend that you also study the other lessons in my extensive collection of online programming tutorials. You will find a consolidated index at www.DickBaldwin.com .

Discussion and sample code

In this section, I will present and explain sample programs that illustrate what the student does need to know and what the studentapparently doesn't need to know.

What the student apparently does need to know

Let's begin with a question. What output is produced by the program shown in Listing 1 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 5 5 8.3 8.3
  • D. 6 4 9.3 7.300000000000001
Listing 1 . Simple increment/decrement.
public class Increment01{ public static void main(String args[]){ new Worker().doWork();}//end main() }//end class definitionclass Worker{ public void doWork(){int w = 5, x = 5; double y = 8.3, z = 8.3;w++;x--; y++;z--;System.out.println(w + " " + x + " " +y + " " + z);}//end doWork() }//end class definition

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Ap computer science a, clarification of the java subset. OpenStax CNX. Oct 03, 2015 Download for free at https://legacy.cnx.org/content/col11279/1.5
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