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Hello and welcome to the goal and programming language course.

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In the previous session, we talked about declaration and initialization of pointers in this session.

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We want to talk about the others pointers concept.

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Neil, pointers in goo goo compiler assign initial value to a pointer very bad in case you don't have

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exact address to be assigned.

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This is done at the time of variable declaration, a pointer that is assigned Neal is called in need

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of pointer.

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The need point there is a constant with a value of zero defined in several standard libraries to check

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for a need point where you can use and if a statement as follows.

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Now go to this code and illustrate how to declaring Neil pointers.

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First, define the point of a variable valve p star and now do the following code for check need or

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not.

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If

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P equals, he calls mean

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so display the message if if the value of B is first x lowercase back is less and and.

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He.

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He the quote, save the project and execute the program.

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Now we can see the output, the value of P is zero.

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On most of the operating systems, programs are not permitted to access memory at address zero because

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that memory is reserved by the operating system.

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However, the memorial address zero has a special significance.

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It signals that the pointer is not intended to point to an accessible memory location, but by convention.

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If a pointer contains the needle or zero value, it is assumed to point to nothing.

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Now go to your slides and continue.

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Changing Poland to a value, you can also change the value of the to or the memory location instead

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of assigning annual value to the value of it.

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Now go to this good program to illustrate the above mentioned concept.

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First, clear, the last court.

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And save the project.

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It's ready to write code.

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First, create a variable using vata keyboard, and we are not defining any type of value, but for

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the example, via a equals 458.

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Now taking a point Revathi been using via Ward without specifying the type that P equals.

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Signed a value that.

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Display value of every bit and avarice of every bit and pawn in therapy before changing.

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FP value stored in a variable equals a go to the next time.

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FP.

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Address a rally there, he calls Anderson a.

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And go to the next line if P value stored in pointer.

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T equals and set the value of the P here before the code and say the project now using Asterix or Create

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will be for points are very able to access.

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The value is stored at the very well at which is it is pointing now write the code if P value.

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It's taught in.

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Star P before changing, he calls the star P.

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Save the project, go to terminal and execute the program until here.

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Now we can see the output value soared in a able equals 458 address of a variable and value a sort in

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point or p r, the hexadecimal format and value is stored in Astra's before changing equals 458.

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Now go to code and change value off point or go to the next line.

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Changing the value of a variable by assigning the new value to the pointer is star p equals for the

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example five hundred and go to the next line and again display.

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The value is stored in asterisks p if p value is stored in star b after changing.

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Equals and set the variable a reformat, the quote saved the project and go terminal and execute again.

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Now we can see the output value restored in this star after changing equals five hundred.

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In this example, the first define a very bad and initialize it, then put the address of that variable

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inside and pointer.

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Now, by changing the pointer value, we will see that the value inside the initial variable also changes.

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In order not to prolong the time of decision, we will finish it and we will continue the content in

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the next session.

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Goodbye.