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In this module, you will Learn the difference between a definite loop and an indefinite loop. I will explain two Scratch programs that approximate the Scratch equivalent of a for loop in other programming languages. In Scratch, it is called a repeat loop. I will provide a brief introduction to the topic of animation. I will also explain the concept of costumes in Scratch. The programs explained in this module will illustrate the use of costumes to implement a crude animation that makes it appear that a cat sprite is walking.

Table of contents

Preface

Scratch 2.0 (released May 9, 2013) is the second major version of Scratch to be released during the life of the product. Among other things, it features a redesigned editor andwebsite, and allows you to edit projects directly from your web browser.

This module (tutorial) is one in a collection of modules designed to help beginners of all ages (8 and up) learn how to create the code for computer programs using Scratch 2.0 . Information is provided not only for the beginners themselves but also for theirparents and teachers where appropriate.

In this module, you will Learn the difference between a definite loop and an indefinite loop . I will explain two Scratch programs that approximate the Scratch equivalent of a for loop in other programming languages. In Scratch, it is called a repeat loop. One of the programs causes a block of code to be executed a fixed number of times when the user clicks the green flag. Theother program causes a block of code to be executed a variable number of times when the user clicks a sprite.

I will provide a brief introduction to the topic of animation. I will also explain the concept of costumes in Scratch. Both of the programs mentioned above will illustrate the use of costumes to implement a crude animationthat makes it appear that a cat sprite is walking.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the imageswhile you are reading about them.

Images

  • Image A . A definite loop for eating cookies.
  • Image B . An indefinite loop for eating cookies.
  • Image C . Pseudocode for the program named ForLoop01.
  • Image D . The costumes tab for a new Scratch project.
  • Image E . Various Scratch blocks.
  • Image F . Program code for the program named ForLoop01.
  • Image G . The cat on the Stage.
  • Image H . Program ForLoop02 output after clicking the green flag.
  • Image I . Program ForLoop02 output after clicking the cat.
  • Image J . Program code for the program named ForLoop02.
  • Image K . ForLoop03 output after clicking the green flag.

Questions & Answers

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
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mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
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Samuel
What is Atoms
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Merolyn
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Merolyn
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Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
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Konadu
how is urine formed in human
Rahma
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Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
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Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
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a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
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Achiri Reply
in the mouth
EZEKIEL
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Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
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endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
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Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
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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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