If you are reading this, I hope you finish cs50 and go on to do well in whatever endeavor you choose.
@thebrightchannel689827 күн бұрын
I will and i hope you will to, good luck!
@MasterOfYourself4 ай бұрын
I love how David is really trying to hear people's questions, and he encourages them with cookies, or jokes.
@kent1k3592 ай бұрын
Best educator imho
@meegel7 ай бұрын
Theres a lot of "A-HA" moments for me this week, it is incredibly motivational for me to keep on learning CS. Thank you Professor Malan and the CS50 team!
@worrystone7 ай бұрын
Feeling honored to experience buffer overflow during the overflow section.
@codewithsajid8 ай бұрын
for those scratching your head at 49:20, perhaps this will help. what is the relationship between arrays and pointers/addresses? --- In C, arrays and pointers are closely related. Here's a breakdown of their relationship: 1. Array Name as a Pointer: When you define an array in C, the array name acts as a pointer to the first element of the array. For instance, if you have int arr[10];, arr can be thought of as a pointer to arr[0]. 2. Pointer Arithmetic: You can perform arithmetic on pointers just as you can with arrays. When you increment a pointer that points to an array, it points to the next element of the array. This is because the size of the type the pointer points to is considered in the arithmetic. 3. Indexing: You can access elements of an array using the subscript notation []. Under the hood, this is converted to pointer arithmetic. The expression arr[i] is equivalent to *(arr + i). This means "get the value at the address arr plus i times the size of the array's element type". --- Thanks chatgpt
@kurrizzle5 ай бұрын
that little disappearing magic trick at 1:28:20 was subtle but nice
@BerkGoknil4 ай бұрын
Even if you have been writing programmes for 20 years, it is an excellent series that must be completed to the end. Thank you David and Harvard.
@realJaeyongLim7 ай бұрын
I started CS50 since 2021 but did not make it to the endpoint. Now I have decided to resume it while serving at the military. I really love watching Professor Malan's lectures:)
@Senko18007 ай бұрын
YES , keep it up champ🏆
@brandoncarris9015Ай бұрын
thank you for your service !!!
@amirabdelli22957 ай бұрын
Starting 2024x here as this is where I was in the 2023x series (and I could definitely benefit from rewatching this one)
@yannicbrose7 ай бұрын
same... :)
@xavier258613 күн бұрын
Thank you so much Professor Malan.
@randomforest_dev5 ай бұрын
CS50 2024 lectures are really awesome!
@The.Oh11832 ай бұрын
Please tell me I'm not the only one whose brain collapsed...
@mohammadsuhaanhaq35902 ай бұрын
you are not my brain also got fried
@MeowMuscleTvАй бұрын
you not alone it diffucult for me too but don't give up !!
@DizzyBusyАй бұрын
No, I had to distract myself with the Euro Cup for a bit before coming back to this week's PSET
@AdityaWilsonАй бұрын
Welcome to the gang
@FigueMonk2 ай бұрын
I am here after trying to understand lecture 5. Probably is good idea to refresh these lecture's concepts. Keep learning folks, one day at time, step by step
@DanielHermeticoh6 ай бұрын
Thank you, David, for your amazing teaching skills! I can't believe I'm being able to understand aaaaall this information having started learning computer science this year
@hmmmzaDev8 ай бұрын
I was just watching the lecture 4 of CS50-2023x and during the break, I have stumbled onto this video. Not sure now if I should continue watching that one or start from here again.
@harpsprince75768 ай бұрын
Same thing with me. That’s exactly what I am thinking
@user-yk1cw8im4h7 ай бұрын
u r just into lecture 4… of course continue with this
@Kampouse7 ай бұрын
its same content only a news "version"
@andoryu146 ай бұрын
the 2024 versions are almost exactly the same and the course itself now asks you to do the 2024 version, and carries over progress from 2023
@kaunglin84472 ай бұрын
I love you David. You are such a wonderful teacher.
@naboulsikhalid7763Ай бұрын
I am overwhelmed by the info introduced and very glad to know it and move with my C computing and programming. Thank you David
@jonathanconnelly6993Ай бұрын
Must finish before the end of summer…. Must finish before the end of summer….. keep going …
@victorbadia6709Ай бұрын
same bro we can do it!
@user-uj6yj9jf1t2 ай бұрын
can't wait to solve the assignment with these new tools. thank you david and whole cs50 team
@hawamigil4291Ай бұрын
What about tideman
@TheIonizatorАй бұрын
@@hawamigil4291 pls no
@davidestadilla82717 ай бұрын
Just want to add something on pointer arithmetic. If you had a pointer to an integer (which consists of 4 bytes) and allocate memory for two integers and for some reason, you want to put values in it using the dereference (*) symbol, you should not do the following: int *n = malloc(sizeof(int) * 2) *n = 1 *(n + 4) = 2 or *(n + sizeof(int)) = 2 Instead, you should do this: int *n = malloc(sizeof(int) * 2) *n = 1 *(n + 1) = 2 No need to type in the quantity of bytes for the specific data type (in this case, it's 4 since it's an integer). C already knows that.
@a23oj285 ай бұрын
Is this the same as an array of ints but just dynamically allocated? Does C know because of the type (int) that n points to or does it infer from the argument of malloc()?
@thezaytunpeach6 ай бұрын
That was a PHENOMENAL lecture but brother did it escalate...
@ridabrahim76047 ай бұрын
there is something guys about changing the string s to char *s, if you do this without the cs50.h you can't change the value of a char in a string, i was going back and forth with chatgpt until i tested it myself, even if professor david changed string s to char *s the actual string which is "Hi!" cannot be changed by trying to change char H like this : s[0] = 'h'; , you're probably asking yourself why and it's because the get_string function is returning an actual array that we store it's address in char *s and not the same thing when creating a string on the fly with the pointer, two different things, if you're creating a string on the fly without using [ ] to tell C it's an array you won't be able to change the characters in the string, I'm telling this to anyone got stuck with this asking himself this question, professor david probably didn't reveal this so things doesn't escalate quickly and I'm only 55min in so probably he's gonna reveal it later.
@ethylmusic6 ай бұрын
string literal vs string in array is the reason for this. the former is immutable
@ridabrahim76045 ай бұрын
@@ethylmusic yeah, at the time it took me a while to get this while the compiler kept giving me errors then i found out it's read only and can't change it until i copy the string to an actual allocated memory and it seems that the get_string function actually does that.
@oanhtuan24084 ай бұрын
Love it again ❤ Thank you, David! This lesson teaches me how we can efficiently open a file by using just its first address.
@user-wm1ix4ej4h2 ай бұрын
what an energetic teacher. Thanks David
@illillillill6 ай бұрын
how wonderful teaching skill
@bpopphixo962722 күн бұрын
each video introduction: All right . This is CS50 LECTURE 3: ALGORITHMS
@harizhakim59832 ай бұрын
the toughest lecture and problems for me so far!
@mr_riyajath6 ай бұрын
I lost my streak of watching one lecture per day, but I convinced myself to resume watching from where I left off. Today, I finished watching lecture 4 and I am determined to complete CS50 by the first week of February. After that, I plan to solve the problem sets and then I am thinking of learning JavaScript next.
@urosuros20726 ай бұрын
no one cares
@davidoffonly6 ай бұрын
@@urosuros2072 hahahaha don't be that harsh man lol
@mr_riyajath5 ай бұрын
@@urosuros2072 did I ever mentioned your name and said that, if you don't like it just leave dude
@lovesickem3Ай бұрын
That's also what I'm doing! I try hard not to fall asleep lol
@ayek707Ай бұрын
Doing the problem sets right after the lectures would be a better idea because your brain is still fresh with knowledge from the lecture.
@ilove0908Ай бұрын
Very useful lecture. Thanks a lot !!
@virendxr7 ай бұрын
21:17 so a pointer is simpy a varible which stores the memeory address of some other variable inside the variable called pointer . So do pointer variables* also have their own address? and can the adrees of pointer variables can be stored in another pointer variable?
@andrewpolakaus7 ай бұрын
Yes. Examples: // x is a char char x; // y is a pointer to a char that stores the address of x char *y = &x // z is a pointer to a pointer to a char that stores the address of y. char **z = &y
@virendxr7 ай бұрын
@@andrewpolakaus woh that's nice, thanks!
@ZerubbabelT.3 ай бұрын
@@andrewpolakaus Why double astrex on z?
@andrewpolakaus3 ай бұрын
@@ZerubbabelT. that's a great question! If we declare "char x" then x is of type "char" i.e. x can store a char. Now iff we declare "char *y" then y is of type "pointer to a char" i.e. y can store the address of a char. And finally, if we declare "char **z" then z is of type "pointer to a pointer to a char" i.e. z can store the address of something that stores the address of a char. Each star add a level of indirection.
@ZerubbabelT.3 ай бұрын
@@andrewpolakaus Got it. Thanks
@sulikns4152Ай бұрын
Yeah David you are great man! thanx a lot🙏🏻
@GenZ_01_Ай бұрын
Pure gold. Thank you Cs50 team
@sibusisomakema77186 ай бұрын
glad to see that the training wheel joke landed this year😂
@brownie20064 ай бұрын
I LOVE CS50
@_allegra7 ай бұрын
1:34:17 Caleb missing the opportunity to down one of the glasses and demonstrate clearing the memory allocation
@muhammadmx7 ай бұрын
that would have not kept the original glasses swaped
@berkaycirak4 ай бұрын
56:12, I have a question about comparison. While we comparing two string, we compare its first char's addresses. Also, while we comparing two integer, why didn't we compare its addresses? I thought, while comparing two equal integer, their addresses will be different. For example, int n = 5; int x=5; . There will be two different addresses for n and x, and if we compare addresses they must be different
@sagarpanwar28454 ай бұрын
because in int we compare their values not their address, because in string your variable contain a address of the first char and in int your variable contain a integer not their address.
@kmlime7 ай бұрын
I miss the old intro 😢 but the course is amazing regardless
@kenlow40484 ай бұрын
mind blowing
@proudathiest2 ай бұрын
If the computer needs a pointer (s) to go to the address of the first char, how does it find s in memory to get to the char?
@mosstah2 ай бұрын
It stores and accesses the pointer in the same way it accesses any other variable, such as storing a char without bothering with any pointers. However, if the pointer was replaced with a simple char variable, the computer would only return that character and wouldn't know to look for the rest of the values in the string which is why the pointer is necessary.
@proudathiest2 ай бұрын
@@mosstah But how does it access any variable? If I write int x = 10, and then use x later in the code, how does it find that x is 10?
@user-mm8ml1ku4g7 ай бұрын
best week of C i bet
@adnancodesweb27 күн бұрын
I listen to this to go to sleep.. This is where I go to when I drift away and start day dreaming 😆
@OkuEfiongАй бұрын
Please what kind of VScode is David using, because my VScode terminal is not working?
@aopen1305 ай бұрын
36:18 oh 32 bit max out at 2 billion addreses. So that's why the FAT32 doesn't go very high in partition like exFAT. Makes sense.
@ares16472 ай бұрын
At 38:45, why put & before s[0] when it was not necessary in a line above and it still worked ? Also, printf format specified we're looking for an address with "%p".
@shubhamshetty39182 ай бұрын
Correct, Both are the same & points to the same address, the first one just points to the first address as a whole while the other points out to the address of the first char in that array. Hope it gives more clarity.
@nbtwall72873 ай бұрын
27:19 Professor Malan said the memory address 'p' is storing an integer. Are memory addresses signed? does the computer track negative spaces in memory?
@shiny51763 ай бұрын
addresses are unsigned integers
@yunleung26313 ай бұрын
Must review notes. I barely understood the lecture
@not_amanullah2 ай бұрын
Thanks ❤
@dxdx796122 күн бұрын
hello I have a question 43:00 char *s and char s[] is the same ?
@sein34915 күн бұрын
char *s points at the first (0th) location of the string. Which means the string will be read from that location till the null (\0) to highlight the whole string. Meanwhile char s[] highlights the whole string (list of chars) right away. hope this helped
@davidc84134 ай бұрын
Professor Malin is an actual robot
@shrutisinghal24903 ай бұрын
Thank you Sir, for amazing teaching😃 will be always thankful for giving us CS50
@ZerubbabelT.3 ай бұрын
21:02 Why am I not getting hexadecimal number?Instead its decimal number
@BonnieByte6 ай бұрын
Very interesting
@codeandtech7710 күн бұрын
I don't really get what the function "malloc ()" really does. Anyone who understands this concept please help me to understand it too.
@hritviksoni608010 күн бұрын
okay ! ill try to explain it, simply put , malloc is a function defined in header file , simply like printf is defined in and get_int defined in , its job is to allocate some space from your memory for you to do something on it for example store some data. Consider these statements 1. char *s = get_string("s: "); 2. char *t = malloc(string length (s) + 1); --> 1. gets string input from user and stores it in s --> 2. allocates memory of string length+1 (+1 to store \0 which signifies the end of a string ) for you to do something in the allocated memory from your storage.
@codeandtech773 күн бұрын
@@hritviksoni6080 Thanks a lot! Appreciate your kindness. I kind of didn't understand this line: " gets string input from user and stores it in s --> 2" .
@gamerdenver78118 ай бұрын
thx
@nicholasvandremo58673 ай бұрын
How is p an integer when it contains alphabetical values? Like 0x123 has 'x' in it`s value?
@ninjamar_3 ай бұрын
0x123 is hexadecimal, which is a type of notation for numbers
@mosstah2 ай бұрын
@@ninjamar_while this is true for the “123” part, the 0x isn’t a part of the value and is just standard convention for indicating that the following number is hexadecimal
@ninjamar_2 ай бұрын
@@mosstah yeah, it helps distinguish between decimal
@shockmethodx5 ай бұрын
Is it convention or preference to say "oh" when encountering a zero?
@wecode0077 ай бұрын
wanted to study at harvard; but failed; dont worry we have david
@phellipecardoso8994Ай бұрын
1:04:00
@regularnick2 ай бұрын
it's kinda sad that he didn't explain with the code how the CS50 get_string actually works. Unfortunately, for now this is the only training wheel I can't take off
@clarerussell12 ай бұрын
It's explained in previous lectures. If you check out their library you will see how get_string works
@JAVPindia0Ай бұрын
Did you mean playlist? When you say library or that's something different from that?@@clarerussell1
@DizzyBusyАй бұрын
I second the previous comment. Just go to the library to see what get_string actually is
@TheNothing937 ай бұрын
DONE
@stormbringer62554 ай бұрын
int a = 9; int b = 0; printf("%i ", a); //Printing the value of a printf("%i ", b); //Printing the value of b printf("%p ", &a); //Printing the address of a printf("%p ", &b); //Printing the address of b printf("%d ", *(&a)); //Printing the value of a using the address of a printf("%d ", *(&b)); //Printing the value of b using the address of b int *c = &a; int *d = &b; printf("%p ", c); //Printing the value of c printf("%p ", d); //Printing the value of d printf("%d ", *c); //Printing the value of the address in c as a pointer value printf("%d ", *d); //Printing the value of the address in d as a pointer value
@not_amanullah6 ай бұрын
Understood++
@nicholasvandremo58673 ай бұрын
@42:32 David says that *s is the address, but isn`t it actually a pointer to the first character in the character array?
@Marco-sm9bu2 ай бұрын
yes, &s is the address
@sinajps3784 ай бұрын
i have a doubt . Why dont we use *s instead of s to print out the string
@DizzyBusyАй бұрын
That was explained in the "Strings" chapter of the video
@Naoty_san7 ай бұрын
30:43
@georgimmitev2 ай бұрын
1:32:26
@murrigo3 ай бұрын
1:43 "or a jif or a ping"... David... my stars I almost stopped watching
@100dripsАй бұрын
after 3 weeks of trying to solve tidemen, i can finally watch this lecture :D
@RameezRasselАй бұрын
hey mah i spend like 16 hours on it and i gave up . i am not able to do the last 2 functions. i dont even have an idea on how to do it. You got any advise for me?
@100dripsАй бұрын
@@RameezRassel 16 hours is nothing, haha 😅 Here was my idea, that finally worked: To detect a cycle, look, if the loser of the pair you are trying to lock is a winner of an already locked pair. If so, is the winner of the pair you are trying to lock the loser in the locked pair? When this is the case, you've detected a very simple cycle. For example, when A is winner over B in the first locked pair and you try to lock in B over A. This is obvious and fairly simple. But if the winner of the pair you are trying to lock is not the loser, you have to check the next pair down the line. So in this case, look if the loser of the first locked pair is the winner of another locked pair. If so, does the loser of this pair equal the winner of the pair you are initially trying to lock in? If yes, a cycle is detected. If not, look for the next locked pair. Hint: a recursive function is very useful for this. I actually did a few exercises with recursion beforehand to really wrap my head around the concept. Good luck, you can do it!
@RameezRasselАй бұрын
@@100drips hey thanks a lot mahn. Really Appreciate it. I was doing my research and it turns out there is an algorithm for traversing throughout graphs. It's called DFS I tried learning it but couldn't wrap my head around it . I think I understand ur logic now I have to code it. We'll see
@thebrightchannel689827 күн бұрын
@@RameezRassel Bro were you able to code it?
@abdulmelik83372 ай бұрын
Questions?
@syedzainulabideen44558 ай бұрын
1like = 5pushups in 2024
@yashsond36757 ай бұрын
Khao maa kasam😂
@Mubashar7833 ай бұрын
@@yashsond3675 Jhoot nhi bol kafi mehnat k bad mera avergae push up rate 40+ he 60+ tk gaya tha jin ko dikhanna tha wo majak bnane lg gae😢
@georgimmitev2 ай бұрын
9:57
@bordercut14 ай бұрын
wow.
@exomk531914 күн бұрын
19:05
@exomk531914 күн бұрын
34:00
@exomk531914 күн бұрын
string = char *
@exomk531914 күн бұрын
42:10
@exomk531914 күн бұрын
43:30 44:40
@prof-pras23 күн бұрын
29:31 haha!!
@quang.luu.1792 ай бұрын
👍👍👍
@hankhan56295 ай бұрын
please save our videos memories and do intermittent fasting for our longevity.
@bpopphixo962716 күн бұрын
Swappp too hard
@duydangdroid2 ай бұрын
29:24 lol
@WizeChoice5 ай бұрын
👉🏾✨✨✨
@bpopphixo962715 күн бұрын
hard vc
@bonjourmonsieur82216 ай бұрын
42 42 42 42 42
@user-lu7ts8hj2i4 ай бұрын
😎😎😍🥰🥰
@4olufade2 ай бұрын
Conor should have made it to the press conference with a broken toe