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  • Click the Data button to expose the variables as shown in Image 3 .
  • Drag the block for the variable named LeftOperand and drop it in the white box immediately to the left of the left angle bracket operator in Image 7 .
  • Drag the block for the variable named RightOperand and drop it in the white box immediately to the right of the left angle bracket operator in Image 7 .

Once we do that, we will have finished the construction of the second script from the top in Image 4 .

Completing the program

Following that, we need to go through essentially the same process to construct the bottom two scripts in Image 4 , using the other two relational operators in Image 6 along with the variables named LeftOperand and RightOperand .

A screen shot of the program output

Image 8 shows a screen shot of the Stage for a given set of values for the variablesnamed LeftOperand and RightOperand .

Image 8. screen shot of the output from the program named relational01.

Missing image.
Image 8. Screen shot of the output from the program named Relational01.

Interpretation of the results

The text showing in the bottom three variables tells us that for these values, the relationships among the values are as follows:

The value of the left operand (-4) is less than the value of the right operand (2).

The value of the left operand (-4) is not equal to the value of the right operand (2).

The value of the left operand (-4) is not greater than the value of the right operand (2).

If you move the sliders to change the values in the left and right operand variables and then click the button, you are likely to get different results.

An online version of this program is available

A copy of this program has been posted online for your review (see Resources for the URL) . If you don't find the program using that URL, search the Scratch site for the usernamed dbal .

Run the program

I encourage you to use the information provided above to write 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.

Just for fun, see if you cause a short drum roll to be produced by your computer speakers each time the button is clicked.

I also encourage you to write the program described below.

Student programming project

Write a project named Relational02 that meets the following specifications:

This program illustrates the use of the following relational operators in addition to arithmetic operators:

<(less than) = (equal to)>(greater than)

This is an upgrade to the program named Relational01 .

The program creates the following six variables and a button and displays them on the stage as shown in Image 9 :

  • LeftOperand - a slider
  • RightOperand - a slider
  • Offset - a slider
  • LessThan
  • Equals
  • GreaterThan

Image 9. screen shot of the output from the program named relational02.

Missing image.
Image 9. Screen shot of the output from the program named Relational02.

Operation of the program

When the user clicks the green flag, the values of all six variables shown in Image 9 are set to 0.

The user slides the three sliders to set the values of LeftOperand , RightOperand , and Offset .

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
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
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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