Hello, What does multiple scope operator (::) in a line means.?

I guess he meant help with "exam"

Nested namespaces or maybe some member of a class inside a namespace etc

I am 17 years old and I come from Italy, I do IT at school and I was trying to do an exercise that was assigned to me but I got stuck in one point

do i have to send the code?

it's a task, if I knew how to do it I didn't ask for help

it's a task, if I knew how to do it I didn't ask for help

but i'm not asking to do it, the boy said i just had to listen to the teacher, but it seems obvious to me that if i knew how to do it i wouldn't ask for help

What might be the problem in my code if redefinition of 'int main()' error is coming??

You can have main function defined only once in your program, because of that you can't define it in a header (maybe you can with inline keyword though). Also you should never include *.cpp files, that also can be a reason. (there's an exception with unity builds when you actually include cpp files, but that is special situation)

i saw a piece of code that did this #if 1 some code here #endif what is it for? won't the code always be executed?

These are preprocessor directives to conditionally compile the code that we want. For example, if you want to use func1 when linux and func2 when windows.

Is there a list of standard modules? Or even better, list of standard modules mapped to includes?

There's no such thing as "standard". Different libraries have different purpose. Suppose you are a mathematics software programmer. You obviously would not need libraries which deal with web technologies.

Share the code

// // Created by hassa on 01/10/2022. // #include <stdio.h> #include <stdlib.h> #include <conio.h> #define size 5 int stack[size]; int top=-1; int data; void push(); void pop(); void peek(); void display(); void push(){ printf("Enter the data that you want "); scanf("%d",&data); if(top==size-1) printf("the stack has been overflow"); else{ top++; stack[top]=size; // pay attention // until be full // it needs to understand much better } } void pop(){ int item; if(top==-1) printf("underflow"); else{ item= stack[top]; // pay attention // and if you dont want to write the pop item there is no need to write this line top--; printf("%d",item); } } void peek(){ // top if(top == -1) printf("the stack is empty"); else printf("the top is %d",stack[top]); } void display(){ for (int i=top ; i>=0 ; i--) { printf("the value of the stack << is %d",stack[i]); } } int main() { int choice=1; int d; do { printf("1- to push it\n"); printf("2- to pup them\n"); printf("3- to show the last top\n"); printf("4- to display them \n"); printf(" pressed 0 to get out \n"); printf("Enter your choice: "); scanf("%d", &choice); switch (choice) { case 1: push(); // printf("\nEnter A value:"); // scanf("%d",&d); break; case 2: pop(); break; case 3: peek(); break; case 4: display(); break; default: printf("wrong choice\n"); } } while (choice !=0);// it will get out if we pressed 0 getch(); }

yes, but 1 is always true so the code will always be included. what's the point of using #if 1 here?

it doesn't give me any errors but its not working as it should have been

Do you know any online compilers that support modules? I tried to enable/use them on wandbox using gcc and clang but without luck: https://wandbox.org/permlink/dRxtXqPMcMPip8gW

check it

Doesn't seem to work, even if choosing "gcc (modules)" https://godbolt.org/z/5xTGGTb3Y Maybe my code is not correct, I used code from examples but I can't find what modules are even available in STL, maybe syntax or naming conventions were changed from the proposal to the actual implementation

From C++20 features I only use concepts and auto&& keyword in function arguments. Modules is very unstable feature, complete implementation coming very slowly

Guys, am I doing something wrong here? (0xFF << 24 | 0xFF << 16 | 0xFF << 8 | 0xFF) == 0xFFFFFFFFF it returns false for me and I don't understand why

lol

Is it reason of your problem?

part of it the C code works, but NodeJS seems to interpret 0xFFFFFFFF as -1 even though it's in a UInt32 context

Is problem solved?

the C part, yeah!

Send plz js code here

I just removed the exceeding F

But code not work correctly?

it works from the C side now there is something wrong with my NodeJS part

All numbers in js is float64, problem comes from this

I found a solution by the way.

Why just use ffi? As I know nodejs have native C/C++ interface

because it's wasm

you can call wasm from js then

YES but nodejs integers are always in two's complement there is no "unsigned" integer thing in js

How you fixed that problem then?

by shifting integers left by 32 and then removing the sign bit

is vs good for c++ or vsc is better? any opinion?

for vs i mean visual studio

https://onlinegdb.com/KGu04aPno How to make the maxword function return exactly the word that is the maximum??? I will be very grateful for any help or advice

Now it finds the length, and I would like it to also find the word itself. I really not understand how to do it

Use c++ strings

Now it finds the length, and I would like it to also find the word itself. I really not understand how to do it

Now it finds the length, and I would like it to also find the word itself. I really not understand how to do it

https://onlinegdb.com/Co_7gjr21 go through this updated code