Actually this is what I'm intending to do: I have a string variable and I want to convert the string inside it into a raw string

How to convert a string input to raw string in cpp?

How can i learn cmake for accustoming to compiling with the gcc command?

You mean you want to CMake to use gcc as a compiler? CMake will determine the compiler to use automatically during the configuration stage (the stage before the build generator). If it didn't choose GCC and you want to force it to choose GCC, you can do it by passing -DCMAKE_C_COMPILER=<path to gcc> -DCMAKE_CXX_COMPILER=<path to gcc> when you use CMake to generate the build file i.e. cmake -DCMAKE_C_COMPILER=<path to gcc> -DCMAKE_CXX_COMPILER=<path to gcc> -S <source tree> -B <build tree>

Not that point. I used to compile c++ file with command like gcc test.cpp -o test but now i need to write cmakelists.txt. So i want to find a document to learn how to write cmakelists . And it's best to explain every line of cmake code by corresponding to a parameter for gcc.

Not that point. I used to compile c++ file with command like gcc test.cpp -o test but now i need to write cmakelists.txt. So i want to find a document to learn how to write cmakelists . And it's best to explain every line of cmake code by corresponding to a parameter for gcc.

Swapping in linked list Anyone tells?

It's easy for doubly linked list

How can i change hier malloc with new ? int d; cin >> d; double** matrix; matrix = (double**) malloc(sizeof(double*)*d); I do that so but it‘s wrong: *matrix = new (double*d)

For matrices what I saw people usually do is they allocate an array of size M*N and address them using them with something like (x+y*M).

Hi hope you are doing well I have a question … Please why we use Void function for sort tables ?? Selection sort , bubble sort ……?

[C language] Hi, I have a file divided into "sections" like this: A1B2C3 //Stuff B4V6N8 //Stuff2 M9N8B5 Let's imagine I want to cancel Stuff2, which may be several lines. Now, in my software I'll make sure the file poiner is set at the beginning of stuff 2. Now, reading on stack Overflow I understand that the only way to do so seems to be copying everything you need on another file, then scrap the old one and so on. Problem is: this file is HUGE, and this thing happens very often... so, I think this method is too slow and heavy for my code, is there another way to do so?

What do you mean by "cancel stuff2"?

Stuff2 is like 100 lines of text. In my implementation it's a text message, and the user wants to delete it from a web site. For this project I'm using a file as a backup for data persistence, therefore if the mex is deleted from the web site, it should be deleted from the backup file, too

Well if you want text deleted from a file, you don't have much of a choice. Since it is a backup copy,you also want to be extra careful. So copying to a new file and writing only the changes you need is the only option. You shouldn't be using a text file as a backup for this case. A document database like MongoDB would be the best fit for this use case.

Let's assume you are sorting a list. You will want to pass the head of the list as a double pointer, that is to say, imagine this is your head: Struct node *head; Well, when summoning bubble sort (imagine you are in function main and then summon function bubble) you'll pass bubble(&head). This means that the node you pass (head) it's a copy, but the address is "real". Therefore, everything you do in bubble will be effective also in main and every other function. If you passed head, bubble would still modify stuff, but it would actually be a copy of the head. Well, since you modify the real thing, then you don't need to return anything. The function will do stuff, but you operated directly on the address where this stuff is stored, therefore, when control is returned to main, you'll keep using head, but the list will be sorted different. If you passed bubble(head), bubble would sort a copy, then control is returned to main and you'll be using the non sorted list. In this second version, you would need bubble to return a pointer:struct node *blubble(struct node *node); Therefore in main you'll do this: Struct node *new=bubble (head), then you'll use new and you'll have the sorted list, head and you'll have the non sorted one. Anyway, the first way is the best one

Let's assume you are sorting a list. You will want to pass the head of the list as a double pointer, that is to say, imagine this is your head: Struct node *head; Well, when summoning bubble sort (imagine you are in function main and then summon function bubble) you'll pass bubble(&head). This means that the node you pass (head) it's a copy, but the address is "real". Therefore, everything you do in bubble will be effective also in main and every other function. If you passed head, bubble would still modify stuff, but it would actually be a copy of the head. Well, since you modify the real thing, then you don't need to return anything. The function will do stuff, but you operated directly on the address where this stuff is stored, therefore, when control is returned to main, you'll keep using head, but the list will be sorted different. If you passed bubble(head), bubble would sort a copy, then control is returned to main and you'll be using the non sorted list. In this second version, you would need bubble to return a pointer:struct node *blubble(struct node *node); Therefore in main you'll do this: Struct node *new=bubble (head), then you'll use new and you'll have the sorted list, head and you'll have the non sorted one. Anyway, the first way is the best one

from where can I get practice questions ?

HackerRank, LeetCode.

I want to start doing projects using c++. Can I get any recommendations??

I want to start doing projects using c++. Can I get any recommendations??

What recommendations do you want?

Any problem I can use C++ to solve

and what is interest to you? writing kernel drivers? programming embedded? coding webservers? gamedev? some graphics utilities?

Kernel drivers, programming embedded and coding webservers

then go for it, I don't think you need more recommendation if you have that info

Ooh okay

Actually, I wanted a site recommendation I could find some projects to do

Oooh okay

Small exercises bro

Hello, How to implement this behavior in compile time: check whether a class owns a member, if does, use it, otherwise check another member, if does, use it, otherwise raise compile error? I am currently trying this, but it does not work: static constexpr Name Contract_1 = []() constexpr->Name { if constexpr (requires() { InternalName<Name>::Contract_1->Name; }) { return InternalName<Name>::Contract_1; } else if constexpr (requires() { InternalName<Name>::Default_1->Name; }) { return InternalName<Name>::Default_1; } else { static_assert(false); } } ();

It is not clear what you want to do here. Do you want to check if a class has a type alias Name in it at compile time?

Sorry, Name is a template parameter. I want to implement this: template<typename Name> struct name_trait { static if ( requires(){internalname<Name>::contract1; } ){ static constexpr Name contract1 = internalname<Name>::contract1; }else{ static constexpr Name contract1 = internalname<Name>::default1; } } i dont know whether i explain clearly now with "static if"

Hello, is there a way to format the console output? (Example: making the text of a single line bold, or change the font size). And if not, how should I format it? Sorry for bad english, thanks to all who will reply.