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Arithmetic operators

The division operation in Listing 2 introduced the use of arithmetic operators.

In computer programming jargon, we speak of operators and operands. Operators operate on operands.

As a real-world example, if you were to go to the hospital for knee surgery, the surgeon would be the operator and you would be the operand . The surgeon would operate on you.

Binary operators

The operators that we will use in the modules in this collection will usually be restricted to those that have two operands, a left operand and a right operand . (Operators with two operands are commonly called binary operators .)

In the function named getHalf in Listing 2 , the "/" character is the division operator. The left operand is incomingParameter and the right operand is 2 . The result is that the incoming parameteris divided by the right operand (2).

Binary arithmetic operators

The binary arithmetic operators supported by JavaScript are shown in Figure 3 .

Figure 3 . Binary arithmetic operators.
+ Addition: Adds the operands - Subtraction: Subtracts the right operand from the left operand* Multiplication: Multiplies the operands / Division: Divides the left operand by the right operand% Modulus: Returns integer remainder of dividing the left operand by the right operand

We will use these operators extensively as we work through the physics exercises in future modules.

Sequence

Of the four items listed under Structured programming earlier, the simplest one is sequence .

The concept of sequence in structured programming simply means that code statements can be executed in sequential order. Listing 2 provides a good example of the sequential execution of statements. The code in Listing 2 shows four sequential statements that begin with document.write.

Selection

The next item that we will discuss from the list under Structured programming is selection . While not as simple as sequence , selection is something that you probably do many times each day without even thinking about it. Therefore, once you understand it, it isn'tcomplicated.

General syntax for selection statement

The general syntax for a selection statement (often called an if-else statement) is shown in Figure 4 .

Figure 4 . General syntax for selection statement.
if(conditional expression is true){ execute code}else{//optional execute alternative code}//end selection statement

A selection statement performs a logical test that returns either true or false. Depending on the result, specific code is executed to control thebehavior of the script.

A real-world analogy

Figure 5 shows a real-world analogy of a selection statement that you might make on your day off.

Figure 5 . Real-world analogy of a selection statement.
if(it is not raining){ Play tennisGo for a walk Relax on the beach}else{//optional Make popcornWatch TV }//end selection statement

In this analogy, you would check outside to confirm that it is not raining. If the condition is true (meaning that it isn't raining), you wouldplay tennis, go for a walk, and then relax on the beach. If it is raining, (meaning that the test condition is false), you would make some popcorn and relax in front of theTV.

Questions & Answers

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
Daniel
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
Maciej
characteristics of micro business
Abigail
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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
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.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Accessible physics concepts for blind students. OpenStax CNX. Oct 02, 2015 Download for free at https://legacy.cnx.org/content/col11294/1.36
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