Hey man, will you ever upload c++ tutorials? You explain everything so amazingly it's very easy to follow. You would make the c++ syntax so much easier to understand
Possibly, if enough people want me to. For now, I've got a lot planned for C programming tutorials and other computer science related topics which I found many people lack knowledge in.
Thank you! We just launched the new website and it now has a shop where you can buy educational materials. If you find something useful there feel free to get as all the money goes into supporting this channel and community: code-vault.net/shop
thanks for the tutorial! but im having trouble understanding how the information gets stored in the variable 'points'. i dont see it being assigned other than the *p = points + i, but this is assigning p? .. sorry if my question is stupid, but im a beginner programmer so its a little bit confusing :)
It's this line that is setting things in the points array: sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val); Since *p = points + i; We know that p points to some element in the points array. Then, in that sscanf line we do: &p->x This is a two step process: p->x means "get whatever is at the address p is pointing to (which is an element in that array) and get the x member of that element" &p->x means "get the address of the result of p->x (from above)" Thus &p->x gives us an address to the x member inside of an element in that points array. Same logic for the rest of the parameters in that sscanf line
Around @8:30, line 22, why would you rather use another struct pointer p instead of just using the struct in line 19 which is points[100]? From what I understand you modified the values on the same address anyway.
Doing this: Point p = points[i]; sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val); Would NOT change the array as p would simply be a copy of "points[i]". But you could use points[i] directly if you don't like that pointer. Instead of sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val); it could be done with: sscanf(buffer, "%d %d %d", &points[i]->x, &points[i]->y, &points[i]->val); The pointer was just used for shortening the code.
Here you can't really use %s, but you can specify that you only want a string with alphanumerics using the %[A-Za-z0-9], then just use that in the combination with the other characters found in that string.
@@CodeVault {\"%[^\"]\",\"%[^\"]\",\"%[^\"]\",\"%[^\"]\"} this is not working {"%[A-Za-z0-9]","%[A-Za-z0-9]","%[A-Za-z0-9]","%[A-Za-z0-9]"} this works..?
Yes, one of the best. How do I store lines from files into an array? I tried few things but failed. My file contains "test line 1 in the first line and in next line test line 2 and so on.... there is a total of four lines. One of the solutions was declaring a 2D array and store the four lines and this made me more confused, could you please help me? thanks :-)
Yea, basically a 2D array or an array of strings should be good enough. You can simply call in a while loop. char strArray[100][100]; while (fgets(strArray[i], 100, file) != NULL) { i++; } Something like this... also, make sure your file has a new line at the end so that the while loop doesn't stop prematurely.
Hi thank you for your videos! Got a question though, in my program i’ve array of struct, struct User* user; And the elements are lets say username[200]; password[200]; But when i’m passing them to int functions, from one function to another, the data that has been saved before seems to vanish For example in a function i strcpy(user[i].username,”bluish”); and it saves successfully but when i pass it to another function it writes for that. Can tell where its problem? And in the function that im saving the username it’s like Signup(&user, i) so that it saves but in the other function it’s just (user,i) as arguements
There are five data (plain text) files, namely, the “students.txt”, “courses.txt”, “registrations.txt”, “criteria.txt”, and “performances.txt” that keep information. Student file keeps the information about students such as the student number, name, surname, and department in abbreviated form. Course file keeps the information about courses such as the course code and course title. Criteria file keeps the information about course assessments such as the course code, course credit value, homework, lab, quiz, midterm, and final percentages. Registration file keeps the information about the student’s registrations such as the student number, academic year, semester, and course code. Performance file keeps the information about the student’s performances such as the student number, course code, and performances. The program should read all given files and should prepare transcripts for each student i am managed to read all files into structures but i am failing to match and collect information for each student @CodeVault please help
I will make a video on that. But it's really the same way as you'd pass an integer. Usually dynamically allocated so that it doesn't get overriden: struct Example e = malloc(sizeof(struct Example)); e->x = 1; e->y = 5; pthread_create(&th, NULL, &routine, e);
@@CodeVault thank you so much for the answer. Is there any platform for asking questions? because the way you introduce processes and threads are perfect and easy understandable.
Yes! I answer questions regularly on our Discord server: discord.code-vault.net There will soon be a similar feature on our website as well: code-vault.net
No. points[i] is equivalent to *(points + i) which returns type Point Which means it would dereference that point. But we want a pointer to it, not the actual value since we want to modify the contents of that array. &points[i] would be equivalent to points + i which returns the type Point*
@@CodeVault why did you use a pointer to insert elements into an array? can't you simply put the values of x,y and val (during every loop) in the array named "points"?
Yep, you can. It was just shorter to write that way. I prefer to have a pointer to the iterated element in the array rather than repeating points[i] everywhere.
It's so that you always call fgets right before checking if you're at the end of file. You could also call it inside but check it twice: while (!feof(file)) { fgets(buffer, 200, file); if (feof(file)) { break; } }
@@CodeVault why did you write an If statement inside while loop? when the file reaches the end of it, then will simply be out of the loop due to the condition set by the while loop
This is assuming that you also process this data in some way. Like this: while (!feof(file)) { fgets(buffer, 200, file); if (feof(file)) { break; } // Processing goes here sscanf(buffer, ...); } If we don't add that if statement, fgets wouldn't read anything and that would prompt sscanf to process the previous value that was in buffer thus duplicating the value (similarly to how I showed in the video)
I am so glad that I found you. Thanks for making these C lecturing videos!
@CodeVault! Hey where are you ! C community miss your videos on youtube !
Hey man, will you ever upload c++ tutorials? You explain everything so amazingly it's very easy to follow. You would make the c++ syntax so much easier to understand
Possibly, if enough people want me to. For now, I've got a lot planned for C programming tutorials and other computer science related topics which I found many people lack knowledge in.
brilliant explanation , thank you!
how can we do this for csv (excel) files
Just change the format string to output CSV:
sscanf(buffer, "%d,%d,%d", &p->x, &p->y, &p->val);
@@CodeVault Thank you
Don't stop making such videos please
Thank you for this amaizing explanation!❤
You just saved my ass right here , Thank youuu.
Thank you very much for your efforts and sharing the knowledge, you are a good person and you will be rewarded for the enlightenment of people.
I'll start this series once I'm done with basic... Thank you 👌
Ok. Sounds good!
Thank you so much legend
what shortcut did you use at 7:45 to select all the dots?
I pressed CTRL+D to create a new cursor at the next occurance of the same selection
@@CodeVault nice!
I'm Brazilian(not English speaker) learning this in English is easier than my teacher lecturing hahahahahahhhaha
as usual, you explained with your heart, so all you demonstrated stayed vivid in my mind. thank you
thank u bro
Hey man... your vids are amazing!!! You deserve more subscribers!!!
Thanks
THANK YOU SO MUCH FOR SAVING MY LIFE AND PROJECT! IT WORKED YEAHHH❤
Dude you saved my mf life! Greetings from Sweden! 🇸🇪
excellent presentation, ill be checking this channel out for sure!!!
Read json array of object deserialize on struct, please
love these vids please continue very good
This helped me a lot, thanks;
yes, thank you, buddyboy ...
I love your videos , please consider making a patreon , i would love to contribute to make this channel bigger ...
Thank you! We just launched the new website and it now has a shop where you can buy educational materials. If you find something useful there feel free to get as all the money goes into supporting this channel and community: code-vault.net/shop
you are the best 🤗🤗🤗
thanks for help
thanks for the tutorial! but im having trouble understanding how the information gets stored in the variable 'points'. i dont see it being assigned other than the *p = points + i, but this is assigning p? .. sorry if my question is stupid, but im a beginner programmer so its a little bit confusing :)
It's this line that is setting things in the points array:
sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val);
Since
*p = points + i;
We know that p points to some element in the points array.
Then, in that sscanf line we do:
&p->x
This is a two step process:
p->x means "get whatever is at the address p is pointing to (which is an element in that array) and get the x member of that element"
&p->x means "get the address of the result of p->x (from above)"
Thus &p->x gives us an address to the x member inside of an element in that points array.
Same logic for the rest of the parameters in that sscanf line
Thank you!
Le di la campanita
Around @8:30, line 22, why would you rather use another struct pointer p instead of just using the struct in line 19 which is points[100]? From what I understand you modified the values on the same address anyway.
Doing this:
Point p = points[i];
sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val);
Would NOT change the array as p would simply be a copy of "points[i]".
But you could use points[i] directly if you don't like that pointer.
Instead of
sscanf(buffer, "%d %d %d", &p->x, &p->y, &p->val);
it could be done with:
sscanf(buffer, "%d %d %d", &points[i]->x, &points[i]->y, &points[i]->val);
The pointer was just used for shortening the code.
@@CodeVault thank you!
{"sam","0004","SDE1","VLSI"}
what will be the de serialization format i.e to read this type of forat
const char* PERSON_FORMAT_IN=....?
Here you can't really use %s, but you can specify that you only want a string with alphanumerics using the %[A-Za-z0-9], then just use that in the combination with the other characters found in that string.
@@CodeVault {\"%[^\"]\",\"%[^\"]\",\"%[^\"]\",\"%[^\"]\"} this is not working
{"%[A-Za-z0-9]","%[A-Za-z0-9]","%[A-Za-z0-9]","%[A-Za-z0-9]"} this works..?
@@bharatnarayana8401 Yep. You just need to not forget about the \ before each "
Sorry for the late reply
Yes, one of the best. How do I store lines from files into an array? I tried few things but failed. My file contains "test line 1 in the first line and in next line test line 2 and so on.... there is a total of four lines. One of the solutions was declaring a 2D array and store the four lines and this made me more confused, could you please help me? thanks :-)
Yea, basically a 2D array or an array of strings should be good enough. You can simply call in a while loop.
char strArray[100][100];
while (fgets(strArray[i], 100, file) != NULL) {
i++;
}
Something like this... also, make sure your file has a new line at the end so that the while loop doesn't stop prematurely.
@@CodeVault Thanks a lot
same thing happens when you do that with class type?
Classes don't exist in C. But, sure, you can use the same technique with classes in C++. But you can use streams there.
Hi thank you for your videos!
Got a question though, in my program i’ve array of struct, struct User* user;
And the elements are lets say
username[200];
password[200];
But when i’m passing them to int functions, from one function to another, the data that has been saved before seems to vanish
For example in a function i strcpy(user[i].username,”bluish”); and it saves successfully but when i pass it to another function it writes for that.
Can tell where its problem?
And in the function that im saving the username it’s like Signup(&user, i) so that it saves but in the other function it’s just (user,i) as arguements
How are you accessing that data?
@@CodeVault ah thank you! It got sorted, the access was also through watch window, thank you for the video it helped me alot :)))
There are five data (plain text) files, namely, the “students.txt”, “courses.txt”, “registrations.txt”, “criteria.txt”, and “performances.txt” that keep information. Student file keeps the information about students such as the student number, name, surname, and department in abbreviated form. Course file keeps the information about courses such as the course code and course title. Criteria file keeps the information about course assessments such as the course code, course credit value, homework, lab, quiz, midterm, and final percentages. Registration file keeps the information about the student’s registrations such as the student number, academic year, semester, and course code. Performance file keeps the information about the student’s performances such as the student number, course code, and performances.
The program should read all given files and should prepare transcripts for each student
i am managed to read all files into structures but i am failing to match and collect information for each student
@CodeVault please help
Head on over to our discord server (link in the description) and you can ask there in more details what your issue is.
@@CodeVault ok thanks man
How do you delete a line of data in a serialized record
The easiest and foolproof way is to just read everything into an array, delete the element and write everything back into it
please make video about List in C.
Here's a playlist for linked lists in C, hope this helps: ua-cam.com/play/PLfqABt5AS4FmXeWuuNDS3XGENJO1VYGxl.html
thank you for perfect explanation would you please describe how we can pass struct and struct arrays to the pthread_creat
I will make a video on that. But it's really the same way as you'd pass an integer. Usually dynamically allocated so that it doesn't get overriden:
struct Example e = malloc(sizeof(struct Example));
e->x = 1;
e->y = 5;
pthread_create(&th, NULL, &routine, e);
@@CodeVault thank you so much for the answer. Is there any platform for asking questions? because the way you introduce processes and threads are perfect and easy understandable.
Yes! I answer questions regularly on our Discord server: discord.code-vault.net
There will soon be a similar feature on our website as well: code-vault.net
When is the next video?
Next week
btw why did you write Point *p=points +i?
can't we do like this Point *p=points[i] ?
No.
points[i] is equivalent to *(points + i) which returns type Point
Which means it would dereference that point. But we want a pointer to it, not the actual value since we want to modify the contents of that array.
&points[i] would be equivalent to points + i which returns the type Point*
@@CodeVault why did you use a pointer to insert elements into an array?
can't you simply put the values of x,y and val (during every loop) in the array named "points"?
@@CodeVault like this
int i=0;
while(!foef(file))
{
sscanf(buffer,"%d %d %d",&points[i].x,&points[i].y,&points[i].val);
i++;
//rest are as usual
}
Yep, you can. It was just shorter to write that way. I prefer to have a pointer to the iterated element in the array rather than repeating points[i] everywhere.
but why you put fgets() out of while loop
It's so that you always call fgets right before checking if you're at the end of file.
You could also call it inside but check it twice:
while (!feof(file)) {
fgets(buffer, 200, file);
if (feof(file)) {
break;
}
}
@@CodeVault why did you write an If statement inside while loop?
when the file reaches the end of it, then will simply be out of the loop due to the condition set by the while loop
This is assuming that you also process this data in some way. Like this:
while (!feof(file)) {
fgets(buffer, 200, file);
if (feof(file)) {
break;
}
// Processing goes here
sscanf(buffer, ...);
}
If we don't add that if statement, fgets wouldn't read anything and that would prompt sscanf to process the previous value that was in buffer thus duplicating the value (similarly to how I showed in the video)
@@CodeVault what if there is only one line of input in txt file?
then what ?
it won't enter the while loop ??
right?