Why i'm getting this weird output ? Maybe it's Initializing "w" on every member call ? also "w" address remains the same

Question

struct window {
int width;
int height;
};

window * create (int x,int y){
window w;
w.width = x;
w.height = y;
return &w;
}

int main (){

window * win = create (800,600);
cout<<win-> width <<endl;
cout <<win -> height <<endl;

}
output:
800
1376882740

Answer 1

The reason why the return value isn't correct is because your function returns the address of a local variable. In this case, 'w' is a local object of struct window - The memory allocated to store the local object is located on the stack, which gets deallocated when the function returns. As soon as you return from the function, 'w' goes out of place and same goes for the address of it. This causes garbage values to be assigned to some parts of your struct object in main().

Answer 2

thank you Nicolas but unfortunately it didn't work same weird output:
1
-1226127952

Answer 3

Solved it my fellow citzen.
Hope it helps in your learning.
There are multiple ways to do it. It's just one of them.

https://code.sololearn.com/cBflJIvzPMFK/?ref=app

Answer 4

This actually makes alot of sense I always thought the "Satck" can't be deallocated and the variables remains in the stack until the program terminates.

thank you Hasty Rei

thank you Nicolas

Answer 5

Brother Mazzin
try this

void Create (Window W, int x, int y)
{
W.width = x;
w.height = y;
}

int main()
{
Window W;
create (W,800,600)
}

and let me know if it worked.

Happy Trails :)