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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

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
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Adin
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Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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Damian Reply
absolutely yes
Daniel
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it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
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what is biological synthesis of nanoparticles
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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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