Understanding the Null Pointers

Data Structures: Understanding the Null Pointers
Topics discussed:
1) What is a Null pointer?
2) The use of Null pointers.
3) Facts related to Null pointer.
4) Best practices related to Null pointers.

Music:
Axol x Alex Skrindo - You [NCS Release]

#DataStructuresByNeso #DataStructures #NullPointer #Pointer

[safimsallam]

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[vaibhavpandey]

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[BCGMCS]

Additional points

1.null pointer is a pointer which points to the memory.where that memory is allocated to OS. We can't assign a memory to already reserved memory for OS. So why it's called null pointer

2.The size of pointer depends on compiler. Which means if the compiler use 16 bit address line then size of pointer is 2bytes like turbo c .if compiler use 32bit address line then the size of pointer is 4 bytes like gcc or if it use 64 bit address line the size of it is 8 bytes like morden gcc. So the size of pointer is only depends on address line of compiler not depends on anything else.

[istutirajeev]

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[VishalYadav-ssqv]

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[xpenguin]

Best explanation on youtube let me tell you

[sandhyagowdu]

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[kunalsoni]

Very helpful video about NULL pointer 😇

[TONY-kqtf]

Nice..need more topics of data Structure

[hrishikeshkashyap]

At 2:43, suppose we declare "ptr" as a void pointer.... Then also, we have to typecast "ptr" to get 0 as output without getting

For example:

int main() {
void *ptr=NULL;
printf("%d", (int*)ptr);
return 0;
}

👆 Like this????

[Red-gf]

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[arunkumar-xunr]

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[firstnamelastname]

1:42 *ptr=NULL;
should be correct during initialization.

[sagarlodhiya]

Difference between Null pointer and Dangling pointer??? by looking at the definition, it's seems to be same.

[DINO]

Is it not incorrect to say that it doesn't point to any memory location since if you look at the memory layout of an operating system a null pointer would be the area beneath the Text/Code segment? Wouldn't it be more correct to say "which points to an invalid memory location" ?

[TakoGod]

the way he pronounced "a null" is very funny

[MissTweenn]

Why should you do a null check before dereferencing a pointer, if it’s null isn’t it going to dereference to 0 anyways

[akaashtripathi]

2:59 there is segmentation fault in vscode

[nagababuveeranki]

What is null pointer assignment error in c?

[totsh]

When I try to initialise a pointer to NULL i get this error: ‘NULL’ undeclared (first use in this function)