When should I typedef structs in C?

It is a common practice to typedef structs in C to avoid writing struct, enum, union all over the place...

For example, in ffmpeg (libavutil, some structs are typedef'd, while some aren't)

For example, in ffmpeg (libavutil, some structs are typedef'd, while some aren't)

Linux kernel coding style forbids using typedef for structures

Yeah I also don`t like to do it for that

For example, in ffmpeg (libavutil, some structs are typedef'd, while some aren't)

Here is some sample code I wrote to describe the difference a little more clearer: https://pastebin.com/Ln4qxYg9

Here is some sample code I wrote to describe the difference a little more clearer: https://pastebin.com/Ln4qxYg9

Thats completely wrong

At least how it is there. Come on just add a second variable with the correct type to make it less confusing for beginners.

Now it looks like the second one would be static or global

Also I the difference is not only at initialization, it is every time you mention the type. Without a typedef: struct some var; with typedef: some var;

But it really populates the global namespace if you typedef anonymous types that's why many do: typedef my_struct { ... } my_struct;

Hi, I'm new of language C, have one tutorial free good for begginers?

Hi, I'm new of language C, have one tutorial free good for begginers?

I was study Python and Pascal.

/get cbook

C++ is like a high level version of C

No, it's not C++ is not C with classes

guys, I have a code that generates 4 arrays, two with matches and two that point to matches, to run in 1 repetition, it works smoothly, but when I perform 2 or more repetitions, in each repetition it adds positions in the array in place to simply update the values

Use paste.ubuntu.com for large code snippets

2 nested loops -> O(n^2) 3 nested loops -> O(n^3)

It is very depend at the scenario, it might be O(n) or O(log(n)) or O(n^10) or something else

How can you in c++ name a text file name after a string?

How can you in c++ name a text file name after a string?

Wat

Wat

String.txt but it doesnt work with string + ".txt"

String.txt but it doesnt work with string + ".txt"

I don't understand what you're talking about

I don't understand what you're talking about

Read a string as a text file name with fstream

Read a string as a text file name with fstream

std::ifstream file { "string.txt" }; std::string str; file >> str;

std::ifstream file { "string.txt" }; std::string str; file >> str;

No as the name of the textfile, if you use double quotes it is no string anymore?

No as the name of the textfile, if you use double quotes it is no string anymore?

I don't understand you

I don't understand you

I will ask the question again with code when I have my computer

I will ask the question again with code when I have my computer

Ok

No as the name of the textfile, if you use double quotes it is no string anymore?

#include <fstream> #include <iostream> int main() { std::string str; std::cin >> str; std::ofstream file{str + ".txt"}; file << "Hello, world!" << std::endl; }

That works

what does double do in c ,I googled it but dint understand.

this is floating double precision type

what does double do in c ,I googled it but dint understand.

It's a type for floating-point numbers

my frnd said it takes int and float

is that wrong

what do you mean "it takes"?

my frnd said it takes int and float

It doesn't make sense

"* Only English language is allowed, if you speak shitty English or don't understand anything in English YOU WILL BE BANNED."

sorry sir I got it ,thank you

#include <fstream> #include <iostream> int main() { std::string str; std::cin >> str; std::ofstream file{str + ".txt"}; file << "Hello, world!" << std::endl; }

Thanks

Thanks

BTW, what did you try?

BTW, what did you try?

I did something like this but didnt work. Also tried with .c_str() but after your answer I think I know the problem

Ah, yes, I see. C-style string is a sequence of chars that ends with '\0'.

You will get weird result if you add char* to char*

include <stdio.h> double a(double x,double y) { double sum; sum=x+y; return sum/2; } main() { double j,h; scanf("%g%g",&j,&h); printf("%g",a(j,h)); }

include <stdio.h> double a(double x,double y) { double sum; sum=x+y; return sum/2; } main() { double j,h; scanf("%g%g",&j,&h); printf("%g",a(j,h)); }

Why can't j and h values not copied to x and y

Why can't j and h values not copied to x and y

What?

'j' and 'h' values which I entered not copied to x and y to get returned

'j' and 'h' values which I entered not copied to x and y to get returned

And how did you understand this?

hm, again iam trying,sorry I want to enter j and h which should be copied to x and y to get average of j and h

hm, again iam trying,sorry I want to enter j and h which should be copied to x and y to get average of j and h

So?

Iam getting error

How did you understand that the values are not copied?

Iam getting error

What error???

Iam asking whether the program is wrong

Screenshot (12-Aug-2020 2:16:19 PM)

include <stdio.h> double a(double x,double y) { double sum; sum=x+y; return sum/2; } main() { double j,h; scanf("%g%g",&j,&h); printf("%g",a(j,h)); }

lg instead of g

Iam getting error

/warn PMing

lg instead of g

Ok, how simple is that, thank you

/warn

what is Pming

what is Pming

Private Message:ing

sorry I got it I never do again

👋

Thats completely wrong

Oops.

Are you an Intel CPU developer? :)

yep)

hi all, who interested in vscode .devcontainer development with cmake and bezel, welcome on my twitch channel, i need help on bezel config, nick the same

Seems like typedef can assign a new name to a data type. typedef unsigned char byte

yeah even a function type

Seems like typedef can assign a new name to a data type. typedef unsigned char byte

So what?

I just learned typedef wrong, thats all.

I just learned typedef wrong, thats all.

Parameter order?

I swear it gets people every time)))

I just learned typedef wrong, thats all.

so what did you think about it?

I thought typedef shortens the initialization of structs and unions.

Thats completely wrong

The post above is the code I wrote, if you want to look at it.

is there any particular reason that the unordered_map simply use collision chaining to deal with hash collision, without strategies of like transforming the linked list to RB tree or copy the data to a new space ruled under a new hash function / memory ？

look into c++ reference

yep)

In which office? Moscow? USA? Israel?

Hi here, need some help please. Here is a segment of code, i want it to run while waiting for user to press a key but it loops just once and stops. Any idea on what i should do? please (I want it to keep printing '1' till the key is entered. #include <ncurses.h> int main (void){ char press; while(press != 'q'){ printf("1"); press = getch(); } printf("You pressed 'q'"); } Thank you

you need to update 'press', because it’s not updating as I see