Pointer Arithmetic (Subtraction)

[@mrmakra-eo1kx]

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[@raviprakashmishra2860]

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[@youmemeyou]

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[@nomad690]

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[@arkadiptadas4148]

Thank you, sir, for providing such quality lectures... Really helped me out in the interviews

[@somasekhardakala2630]

I'm learning so much from your videos...Thank you...

[@arularasij3099]

I have really learned a lot. I had easily understand the concepts with the help of your videos . Thank you so much sir

[@adithyasaiendla2485]

Now concepts r crystal clear

[@rinto_rnr]

Thanks for the great lecture you really saved me before my final exams.

[@tails_the_god]

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[@cristianrestrepolopez976]

really helpful!

[@creatorsayanb]

5:36 there should be *eqality, not inequality. I think that's a simple mistake. Thanks again for changing their life of so many students.

[@brycehazen]

@7:19 did you mean to say the first element of array b? Isn't it point to the 3rd element?

[@BobChevy73]

I Think he meant 4th element. Index 3 is the fourth element. Index 0 is the first.

[@adityasagarr]

same thing here..

[@sunilkarpe1518]

Why we can't add two pointers which are assigned to array Like p+q...(why only p-q is allowed)

[@MonikaSingh-ee6yv]

Sir , how do I improve competitive coding skills? Please make video on it. Thanks in advance

[@MrCEO-jw1vm]

thanks so much for this wonferful content!

[@NMAJJINEERAJA]

Really awesome sir actually I have a doubt on my mind while watching the video then I posted in comments but after watching the remaining video I got the answer for my question Thank you very much sir

[@andre8844]

While practicing, I noticed if you make maybe q point to an address beyond the array length, maybe a[10], you will be getting some weird values. If in your program you have another array, you may end up pointing to a value in that array. Help make sense of c. I don't wanna be in a c(sea) of problems

[@nikhilanand984]

what do you mean by running the program online and offline??

[@nikhilanand984]

sir what will be the output if we take initially the index 0 and then subtract from it any positive integer.

[@kamyagupta4030]

thank you ♥️

[@NMAJJINEERAJA]

Here we are using array and simply adding or subtracting the integer value from the pointer but if we are not dealing with the arrays and they asked to add 3 to the integer pointer without providing base then is it print error. Or any garbage value 🤔

[@manupareek8776]

any ways great teaching!

[@manupareek8776]

sir. is the c language course completed? if not, then how much course is completed? i mean is it 80% or 70% complete?

[@kavanajois9435]

you are genius

[@true4189]

Thank u

[@bishnupadamaity4198]

What if we want to subtract 3 from a[0] ?

[@oggy107]

if we subtract something from base address of arr[0] then it simply means that the resulting adress will be out the range of that array and it will produce unexpected result.

[@cuteonigiri1671]

2 yrs late but ig a[0]-3 is the answer?

[@cuteonigiri1671]

int *p=&a[0]; *p-3 also can do

[@yevgeni10]

7:20 pointer q points to the first Array element ??

[@marbles5590]

7:21 *must be fourth element in b[ ]

[@kornmc]

i think subtraction in array output is giving not a array element. outpu giving only integer ?

[@rockstarmani]

Can any one clarify me??? If we substract two pointers Belonging to Same array,we can access element of corresponding index! What happen if we add two pointers of a same array??? Is it garbage value??? p and q are pointing to same array! Int *p; Int *q; Printf("%d",*(p+q)); o/p???

[@dipeshranadipeshrana881]

It's illegal in c. Try yourself by writing program

[@abhishekkumarsingh755]

Sir, if *p = &a[0] and *q = &a[3] and if we subtract q - p we still get &a[3], but in array should'nt we take one step backward from 3 and get &a[2}. ?

[@dipeshranadipeshrana881]

No search in Google. Subtracting pointer gives distance between element of array. So like a+2 points to third element . subtracting address of first element and third element will give 2 hence printing a[q-p] prints third element

[@MysticRogue_09]

At 4:18 what happens if we do p-q will it give error ?

[@anubhabpanda6503]

-7 o/p

[@janaey158]

So is p=p-3 not a legal argument? I have to multiply to achieve the correct result?

[@sunilkarpe1518]

Why we can't add two pointers which are assigned to array Like p+q...(why only p-q is allowed)

[@cuteonigiri1671]

supposedly q=&a[0], where p contain address of a (assume 1000 as a[0] address) p=&a[1], address = 1004 since 1 element contain 4 byte. if u do p-q, u will get the element in the array. p-q = (1004-1000)\4 = 1. so a[p-q]=a[1]. if u do p+q=(1004+1000)\4 = 501 a[p+q] = a[501]. unless u have the element in a[501], it might give u garbage value

[@cuteonigiri1671]

please correct me if im wrong. cuz thts how i understand it

[@devsutong]

do we actually have to do this?? i didnt divide by 4 but it still works!?

[@indiancoder8301]

How much % of the course is completed

[@subasris7151]

what happens when two pointers are added ?

[@harcharansingh1997]

At last question how output offline comes -1 plzzz anyone explain it

[@yoddha621]

Its not about online and offline you will always get different value when you add or subtract two pointers pointing to two different arrays.

[@qandos-nour]

why the distance between pointers is 4 not 3??

[@devsutong]

because integers are hardcoded in c language to take 4byte of memory space in the memory

[@kshitizshrestha9398]

@@devsutong Not actually, It depends on the architecture of the computer that how much memory does an integer or any other data type take. Back in the days, a 16-bit architecture used to take an int as 2 bytes.

[@devsutong]

@@kshitizshrestha9398 youre right its architecture specific

[@utkarshsingh8251]

can i subtract 3 from 0

[@vikashmishra1903]

Yup It will give uh garbage value(not error)

[@quantumnature6641]

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[@santhosh6784]

What will happen if p points to the first element of an array and we are going to subtract an integer from it, like this int a[ ] = { 1,2,3,4 }; int *p = a; printf("%d", *(p - 1));

[@raviranjanjha3677]

Garbage value

[@chintumohan6110]

@@raviranjanjha3677 why we did not use * in print statement for both p and q it producing error without *

[@gowthams4360]

I think it produce error the pointer is staying at starting position.it can't go back it's illegal

[@anuragupadhayay4505]

p = &a[0]; p = p - 1; //This'll be an error right?

[@cuteonigiri1671]

it wont gives u error but the result of the address number of a[0] being subtracted by 1. for example, my result = 6475263 like tht.

[@abhishekbiswas2267]

I did *ptr = & a[0] and then ptr = ptr-3; suddenly I see blue screen "your system ran into an error" 😭😭🤣😁

[@shaikhsaberaalam1019]

can't the base pointer be 996 instead of 1000?

[@vikashmishra1903]

He is just assuming the base as 1000 so it can make calculation easier that's it...if uh bad in maths and beginner in programming than take base as 437 (random) than perform operation uh will get confuse.

[@shaikhsaberaalam1019]

@@vikashmishra1903 thank you

[@vikashmishra1903]

@@shaikhsaberaalam1019 come come welcome 🤗

[@hetaeramancer]

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[@hellocreep8986]

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[@mehedihassan4653]

😣😵😵

[@durnibar3886]

#include int main() { int a[] = {1, 2, 3, 4, 6, 4}; int *ptr = &a[2], *q = &a[5]; printf("%d %d ", ptr, q); printf("%d", q - ptr); return 0; } it should have given output 12, but why the hell is it giving output 3

[@cuteonigiri1671]

because u r subtracting the the address instead of the element. u should use *q - *ptr instead

[@cuteonigiri1671]

#include int main() { int a[]={5,47,65,43,10}; int *p,*q; p= &a[3]; q= &a[0]; int sub=a[p-q]; printf("%d", sub); } i did it like this to print the element after subtracting between the pointer tho i dont the use of subtracting them...

[@hardikpatel352]

can anyone please give the solution of this #include char *c[] = {"GeksQuiz", "MCQ", "TEST", "QUIZ"}; char **cp[] = {c+3, c+2, c+1, c}; char ***cpp = cp; int main() { printf("%s ", **++cpp); printf("%s ", *--*++cpp+3); printf("%s ", *cpp[-2]+3); printf("%s ", cpp[-1][-1]+1); return 0; }

[@true4189]

Thank u