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Image 6. example blocks with pointed ends.

Missing image.
Image 6. Example blocks with pointed ends.

Run the program

I encourage you to use the information provided above along with the Scratch Programming Environment shown in Image 1 to write and run this program. Experiment with the code, making changes, and observing the results of yourchanges. Make certain that you can explain why your changes behave as they do.

A copy of this program has been posted online for your review.

I also encourage you to write the programs described below.

Student programming projects

The following projects are designed to:

  • Help the student retain the knowledge gained by studying the module.
  • Require the student to think beyond the material presented in the module by requiring the student to answer the question "How do I ...?"

Project 1

Begin with the program named Variable01 and modify it to create a new program named Variable02 . Modify the original program in such a way that pressing the space bar five times in succession, (after clicking the green flag to set both variables to zero) , will cause the displayed values of the variables named Counter and counter to be as shown in Image 7 .

Image 7. output from project 1.

Missing image.
Image 7. Output from Project 1.

Having reached that point, clicking the mouse five times in succession in the Stage area will cause the displayed values of the variables named Counter and counter to be as shown in Image 8 .

Image 8. output from project 1.

Missing image.
Image 8. Output from Project 1.

A copy of this program is posted online for your review.

Project 2

You should successfully complete Project 1 before attempting this project. Begin with the program named Variable01 and modify it to create a new program named Variable03 . Modify the original program in such a way that pressing the space bar five timesin succession, (after clicking the green flag to set both variables to zero) , will cause the displayed values of the variables named Counter and counter to be as shown in Image 9 .

Image 9. output from project 2.

Missing image.
Image 9. Output from Project 2.

Having reached that point, clicking the mouse five times in succession in the Stage area will cause the displayed values of the variables named Counter and counter to be as shown in Image 10 .

Image 10. output from project 2.

Missing image.
Image 10. Output from Project 2.

Hint: Compare the values of the variable named counter in Project 2 with the values of the variable named counter in Project 1 to determine what you need to do to successfully write Project 2 .

A copy of this program is posted online for your review (see Resources for the URL) .

Summary

I began by providing an overview of computer programming. Then I provided technical explanations for memory, variables, and literals.

I explained the meaning of the term algorithm.

I presented and explained a Scratch program that is designed to illustrate the creation and use of variables in a computer program. The Scratch programalso illustrates case sensitivity in variable names along with the ability to detect and respond to events fired by the keyboard and events fired by themouse.

Finally I presented two student programming projects that are designed to:

  • Help the student retain the knowledge gained by studying the module.
  • Require the student to think beyond the material presented in the module by requiring the student to answer the question "How do I ...?"

What's next?

In the next module, I will continue the process of helping you to learn about the following computer programming concepts using Scratch:

  • Variables
  • Expressions and Operators
  • Sequence, Selection, and Loop Structures

Resources

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Scr0120: Memory, Variables, and Literals
  • File: Scr0120.htm
  • Published: 03/24/13
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware 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 of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

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

-end-

Questions & Answers

a diagram of an adult mosquito
mubarak Reply
what are white blood cells
Mlungisi Reply
white blood cell is part of the immune system. that help fight the infection.
MG
what about tissue celss
Mlungisi
Cells with a similar function, form a tissue. For example the nervous tissue is composed by cells:neurons and glia cells. Muscle tissue, is composed by different cells.
Anastasiya
I need further explanation coz celewi anything guys,,,
Calvin Reply
hey guys
Isala
on what?
Anastasiya
is air homogenous or hetrogenous
damiane Reply
homogenous
Kevin
why saying homogenous?
Isala
explain if oxygen is necessary for photosynthesis
Allice Reply
explain if oxygen is necessary for photosynthesis
Allice Reply
Yes, the plant does need oxygen. The plant uses oxygen, water, light, and produced food. The plant use process called photosynthesis.
MG
By using the energy of sunlight, plants convert carbon dioxide and water into carbohydrates and oxygen by photosynthesis. This happens during the day and sunlight is needed.
NOBLE
no. it s a product of the process
Anastasiya
yet still is it needed?
NOBLE
no. The reaction is: 6CO2+6H20+ solar energy =C6H12O6(glucose)+602. The plant requires Carbon dioxyde, light, and water Only, and produces glucose and oxygen( which is a waste).
Anastasiya
what was the question
NOBLE Reply
joining
Godfrey
the specific one
NOBLE
the study of non and living organism is called.
Godfrey
Is call biology
Alohan
yeah
NOBLE
yes
Usher
what Is ecology
Musonda Reply
what is a cell
Emmanuel Reply
A cell is a basic structure and functional unit of life
Ndongya
what is biolgy
Hawwi Reply
is the study of living and non living organisms
Ahmed
may u draw the female organ
MARTIN Reply
i dont understand
Asal
:/
Asal
me too
DAVID
anabolism and catabolism
Sani Reply
Anabolism refers to the process in methabolism in which complex molecules are formed "built" and requires energy to happen. Catabolism is the opposite process: complex molecules are deconstructed releasing energy, such as during glicolysis.
Anastasiya
Explain briefly independent assortment gene .
Otu Reply
hi
Amargo
hi I'm Anatalia
Joy
what do you mean by pituitary gland
Digambar
draw and lable the cell
Ameh Reply
why homones are destroyed soon after completing their role
Nyirenda Reply
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Source:  OpenStax, Teaching beginners to code. OpenStax CNX. May 27, 2013 Download for free at http://cnx.org/content/col11498/1.20
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