are you sure? it’s working correctly

http://cpp.sh/ code tested by this site and result is This numbers are: 19 10 8 17 9 15

so? what’s the problem?

Hi, I'm C++ beginner I need help to understand below code: #include<iostream> using namespace std; int main() { int x[6] = {19,10,8,17,9,15}; cout << "This numbers are: "; for (int n:x){ cout << n << " "; } return 0; } Result will be as like as: This numbers are: 19 10 8 17 9 15 But my CodeBlocks showing like that: 4354238 4354238 4354238 continue showing without break

so? what’s the problem?

It happens to me sometimes... I just restart my IDE and then it works fine

If I use the for (int n:x){ cout << n << " "; } then the problem showing But: for (int i=0; i<6; i++){ cout << x[i] << " "; } showing fine. Experts help me to understand please.

AND COMPILE WITH CLANG-9?

HOW I CAN USE C++ IN WINDOWS

If I use the for (int n:x){ cout << n << " "; } then the problem showing But: for (int i=0; i<6; i++){ cout << x[i] << " "; } showing fine. Experts help me to understand please.

Do you try to compile it with C++ version before C++11?

Do you try to compile it with C++ version before C++11?

No

What is the O(n) ?

Thanks bro

What compiler your CodeBlocks uses, can you look it up? I haven't used CodeBlocks so not sure how to find it there

hey, for the structure typedef struct { float m; unsigned int e; }Monom; So if I do Monom *polynome=(Monom *) malloc(s); ``` when I do sizeof(polynome) I get always 8.. But I want the size of my array... How can I do ? Thanks in advance

No, I'm not sure about that. That's mean I have to study more about CodeBlocks. Right?

which array?

It just feels that you use some old compiler, I wanted to check that https://superuser.com/questions/206157/checking-version-of-gcc-compiler-in-codeblocks

polynome is a struct pointer not an array

polynome is a struct pointer not an array

pointer to array allocated in heap/dynamic memory I think.

It's written xclusively in C but yes you right

so how can I declare that as an array?

Ok thanks

you want an array of a struct?

so the problem come from a ?

WHY DO YOU SCREAM? https://devblogs.microsoft.com/cppblog/clang-llvm-support-in-visual-studio/

easy: Monom *polynome = malloc(numberOfElements * sizeof(Monom))

I’m in vscode

I tried to show sizeof in the function where I created it and still have 8 not the size of the array polynome

so i called the function Monom * poly_write(){ ... } In main I use : Monom *a=poly_write(); sizeof(a); //still equal to 8

Just download a CLI compiler like GCC or a GCC extension in VS Code

I need clang..

I need clang..

Just if you find out what version it uses, check that it's not very old, and if it is old, just update your compiler.

int sizeof_array = sizeof(Monom) * number_of_elements;

How do i get teh number_of_elements that is my question

I tried to show sizeof in the function where I created it and still have 8 not the size of the array polynome

sizeof operator can't figure out how many elements your array have.

Ok thanks for the informations, i wasn't aware of it. So there is a tips to know th length of an array ?

Ok thanks for the informations, i wasn't aware of it. So there is a tips to know th length of an array ?

Save it at the time of declaration

Just define the size: #DEFINE SizeOfArray = 10, for example

Assuming it's a dynamic array, people usually wrap it in an object Which holds both the array and an int stating the size

So a new struct ?

Hmm I can't do that it's dynamic

Ok thanks for the informations, i wasn't aware of it. So there is a tips to know th length of an array ?

man, we told you :)) you should write something like this: int num_of_elems = 5; Monom* m = malloc(num_of_elemnts*sizeof(Monom)); int sizeof_m = sizeof(Monom)*num_of_elems; and if you wanna get the array size everywhere you should just pass num_of_elems.

but it’s also a bad practice, allocating memory is costly. You should have minimum memory size alocated, then if it’s full you copy the elements and free it. Then make a new array with something like double the size. This is how you should implement dynamic arrays

Alsoo it's worth mentioning that calling sizeof on a dyanmic array will yield the size of the first element, since a dynamic array is really just a pointer to the first element, hence why it's so problematic