<< Chapter < Page Chapter >> Page >
Figure 3 . Floating point errors.
>>>10/3 + 20/3 10.0

However, in this case, Python returned an answer of 10.0, indicating that the answer is accurate to three significant figures. This is not really thecorrect answer, but as a practical matter, it may be the best answer. I will leave that for you to decide.

Go back to Question 11

Answer 10

Probably not. Floating point arithmetic often suffers from speed penalties. In addition, integer arithmetic produces exact results while floating pointarithmetic usually produces approximate results (although the approximations may be very close to being exact in many cases) .

Go back to Question 10

Answer 9

Floating point usually provides the greater range for storage of numeric values.

Go back to Question 9

Answer 8

The assignment operator causes the value of its right operand to be stored in the memory location identified by its left operand.

Go back to Question 8

Answer 7

An example of such a program is shown in Figure 1 . Note that the names of the two variables have the same letters, but different case.The fact that the two variables are different variables is illustrated by the fact that each is assigned a different value. The sum of the two variablesdemonstrates that the two variables contain different, and correct, values.

Figure 1 . Same letters, different case.
>>>aX=10 # this is one variable>>>Ax=20 # this is a different variable>>>aX+Ax 30>>>

Contrast the above result with the program in Figure 2 where a variable whose name contains the same letters and the same case isused twice.

Figure 2 . Same letters, same case.
>>>ax=10>>>ax=20>>>ax+ax 40>>>

All the program in Figure 2 accomplishes is the assignment of two different values to the same variable. The secondassignment overwrites the value previously assigned to the variable. The program then adds thevariable to itself using its current value of 20 producing a result of 40 (instead of 30 as in the previous example) .

Go back to Question 7

Answer 6

False. Variable names must begin with a letter or underscore character.

Go back to Question 6

Answer 5

Use meaningful variable names for which the spelling is obvious, such as theOverheadRate .

Go back to Question 5

Answer 4

Several different kinds of problems can result from making typing errors that result in misspelling the names of variables. These errors usually result inprograms that produce incorrect results without warning.

Go back to Question 4

Answer 3

False. Variable declarations are not required in Python. All that is required to cause a variable to come into existence is to invent a new name fora variable and assign a value to it.

Go back to Question 3

Answer 2

False. Python is not a strongly typed language. From a pure technical viewpoint, the Python programmer rarely needs to be concerned about type.

Go back to Question 2

Answer 1

False. The value of a variable is intended to change during the execution of the program. The value of a constant (which I haven't discussed so far in this collection) is not intended to change.

Go back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Itse1359-1030r-Review
  • File: Itse1359-1030r.htm
  • Published: 10/14/14
  • Revised: 20/20/15
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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
for teaching engĺish at school how nano technology help us
Anassong
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
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
what's the program
Jordan
?
Jordan
what chemical
Jordan
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Itse 1359 introduction to scripting languages: python. OpenStax CNX. Jan 22, 2016 Download for free at https://legacy.cnx.org/content/col11713/1.32
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Itse 1359 introduction to scripting languages: python' conversation and receive update notifications?

Ask