1.4 Scr0340: arithmetic operators in scratch 2.0

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The purpose of this module is to teach you about operators and operands in general and arithmetic operators in particular. You will also learn about expressions and statements, and you will learn how to write a Scratch program that illustrates the use of arithmetic operators in Scratch.

Preface

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

This module 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 their parents and teachers where appropriate.

The purpose of this module is to teach you about operators and operands in general and arithmetic operators in particular. You will also learn about expressions and statements, and you will learn how to write a Scratch program that illustrates the use of arithmetic operators in Scratch.

I will also provide the specifications for a student-programming project for you to complete in order to demonstrate your understanding of what you learnedfrom the first program.

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 images while you are reading about them.

Images

• Image 1 . Reduced screen shot of Arithmetic01 programming interface.
• Image 2 . Expanded view of the rightmost panel.
• Image 3 . Preparing to use the arithmetic operators.
• Image 4 . Result of dropping addition and subtraction operators into variable blocks.
• Image 5 . Stage area of the finished program.
• Image 6 . Making the button say ouch.
• Image 7 . Output from student project program named Arithmetic02.

Operators

Operators are the action elements of a computer program. They perform actions such as adding two variables, dividing one variable by another variable,comparing one variable to another variable, etc.

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