# Class 8 Computer Book PDF

‘NCERT Computer Books for Class 8’ PDF Quick download link is given at the bottom of this article. You can see the PDF demo, size of the PDF, page numbers, and direct download Free PDF of ‘Chapterwisw Class 8 Computer Book ‘ using the download button.

Table of Contents

## Class VIII Computer Book PDF Free Download

### Class 8 Computer

1. A flowchart is a type of diagram that represents an algorithm or process, showing the steps as boxes of various kinds, and their order by connecting them with arrows.
2. Flowline symbols are used to connect the symbols and indicate the flow of logic.
3. The terminal symbol is used to represent the beginning (Start) or end (End) of the task.
4. Input/Output symbol used to represent reading or writing operations.
5. Processing symbol used for arithmetic and data manipulation operations.
6. Decision-making symbol used to represent any logic and comparison operations.
1. What is a flowchart?
2. What is the use of a flowchart?
3. Draw the flowchart for

a) Find the addition of two numbers.

b) Find whether a people eligible to vote or not.

c) Find the given number even or odd.

d) Find whether a person drives a car or not.

Pen(P)
• Path Selection (A): Use this tool to move entire paths around the canvas as a single object. The path or shape layer retains its shape.

• Direct Selection (A): Use this tool to select and move individual points and Bezier handles of a path or shape layer.

• Pen (P): Create paths with the Pen tool (shown in Single-click to create individual points to form the path. Click, hold, and drag to create a Bezier curve when drawing a path.

• Freeform Pen (P): With this tool, click, hold, and draw a path. Points of the path are created automatically.

Rectangular Marquee

 Elliptical Marquee
 Single column Marquee
 Single Row Marquee

Lasso

 Polygonal Lasso
 Magnetic Lasso
 Quick Selection
Magic Wand

Crop and Slice tools

 Crop
 slice
 Slice Select

Measuring tools

 Eyedropper
 color Sampler
 Ruler
 Note
 Count

Retouching tools

 Spot Healing Brush
 Healing Brush
 Patch
 Red Eye
 Magic Eraser
 Blur
 Sharpen
 Smudge
 Dodge
 Burn

Sponge You will learn

• Add Anchor Point (P): Use this tool to click part of a path to add a point to the path.

Adding an anchor point to your path or shape layer allows for more detail in the path or shape.

• Delete Anchor Point (P): Use this tool to click a point of a path to remove that point from the path.

• Convert Anchor Point (P): Single-click a point of a path to convert it to a corner point.

Or click and drag to convert it to a curve point. Or Option-click (Mac users) or Alt-click (Windows users) and drag to convert it to a combination point.

Jyoti: When we register with a website, we have to give some personal information, like email address, and phone number and we have to also enter a password. How is this information kept secret? Moz: Good point.

Let us take an example. I want to pass on the message “Leaving for Delhi today”, to you.

Now let us modify this using some code so that others cannot understand.

What is the code? Moz: You can build your own code.

For example, we can decide that every letter in the message will be replaced by the fourth letter after its position in the alphabet.

Tejas: That means instead of ‘A’ we write ‘D’. Instead of ‘L’ we write ‘O’. This is fun.
Moz: This process of building a secret code by transforming information using an algorithm is called encryption.

The code is called Cipher. Jyoti: Let us encrypt the given line. Let us first write down this code (cipher)!

#### Creating a Quick Mask

Quick Mask mode lets you edit any selection as a mask without using the Channels palette while viewing your image.

The advantage of editing your selection as a mask is that you can use almost any Photoshop tool or filter to modify the mask.

For example, if you create a rectangular selection with the marquee tool, you can enter Quick Mask mode and use the paintbrush to extend or contract the selection.

Quick Masks are temporary, so if you create one you really like, be sure to choose Select→Save Selection at the end. Follow these steps to create your very own Quick Mask:

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