my ncurses window isn't appearing on my terminal

I'm new to Ncurses and I tried to make a program in C++ that makes a window then displays a box and text on both the box and standard screen.

Here is my code

#include <iostream>
#include <ncurses.h>
using namespace std;

int main(){
	initscr();
	int h,w,y,x;
	h = 10;
	w = 25;
	y = 15;
	x = 20;
	WINDOW * win = newwin(h ,w, y, x);
	box(win,0,0);
	wrefresh(win);
	printw("Hello");
	wprintw(win,"hi");
	wrefresh(win);
	getch();
	refresh();
	endwin();
	
	return 0;
	}

Any help is greatly appreciated.

It's possible that the problem is with the window's position (y and x coordinates). Set y=0 and x=0 to position the window in the upper-left corner of the screen and see if it appears.

You can also check if ncurses is properly initialised by adding if (!initscr()) endwin(); return 1;} at the beginning of the main function to ensure that ncurses has been successfully initialised.

The updated code is as follows:

#include <iostream>
#include <ncurses.h>

int main() {
  if (!initscr()) {
    endwin();
    return 1;
  }

  int h = 10, w = 25, y = 0, x = 0;
  WINDOW *win = newwin(h, w, y, x);

  box(win, 0, 0);
  wrefresh(win);
  printw("Hello");
  wprintw(win, "hi");
  wrefresh(win);
  getch();
  refresh();
  endwin();

  return 0;
}