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In this lecture, I would like to talk about coding books, so why we need coding blocks, code books

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are used to group together lines of code that has the same purpose, like in case of which we use which

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to decide the color of the car and printed out a text based on that.

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So what coding books are by definition, they are zero or more statements enclosed embraces, but it

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can be a for loop.

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And if statement a class or something else with curly braces, we are going to see some letters for

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code blocks and see how variables can be accessed in and outside of a code.

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OK, all right, let's do this.

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A code block has a starting curly brace and an ending curly brace, and the code that belongs to it

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is between the braces.

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We can also have situations when we have a code lock in another one, we have a blue and a red here,

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the red code block, and before the blue one, let's see a concrete example for this.

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We can have a for loop with an if statement in it for loop block wraps the if statement and if block

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is part of the four block.

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Now, let's move on to variable access, the best way to explain this is by using an example.

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So we have two blocks here, an inner and outer.

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If you create a variable outside of the red block, you can still access it in the red block and you

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can even modify it by the end of this code, the number of the owners will be six.

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Now, let's take another example when you define a variable in the red.

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So now the number of the owner is variable in the red, but we would like to access it outside of the

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red.

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The problem is that after the red block is ended, that variable stopped existing.

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So we get an error if we would like to use that.

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We call these type of variables local variables, there are other types of variables like class variables

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that will be covered later in the course.

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That's all about code blocks.

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It was a shorter one.

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Now, let's move on to the coding part.