exposurses

	post_menu(aperture_menu);
	wrefresh(exposure_win);
	wrefresh(iso_win);
	wrefresh(shutter_win);
	wrefresh(aperture_win);
	attron(COLOR_PAIR(2));
	mvprintw(LINES - 2, 0, "Select EV");
	/*mvprintw(LINES - 2, 0, "Select ISO and then one of Shutter/Aperture to calculate other of Shutter/Aperture");*/
	mvprintw(LINES - 1, 0, "Arrow keys to navigate, Enter to select, Q to exit");
	attroff(COLOR_PAIR(2));
	refresh();

	/* set default menu */
	/* Set default menu */
	menu = &exposure_menu;
	win = &exposure_win;

	while((c = getch()) != 81) { /* 81 is Q */
		switch(c) {
			case KEY_LEFT:
				if (selection_counter > 2) {

				break;
			case 10: { /* ENTER */
				ITEM *cur;
				void (*p)(char *);

				cur = current_item(*menu);
				p = item_userptr(cur);
				/* Learning notes - Don't understand this bit */
				/* Learning notes - Don't understand this bit. Is this a function pointer? */
				/* Is this a function pointer? */
				p((char *)item_name(cur));
				/* need to igore over/under if selected, probably easier than try to prevent selection */
				/* Need to igore over/under if selected, probably easier than try to prevent selection */
				if (!((strcmp("OVER", shutter_sel) == 0)
						|| (strcmp("UNDER", shutter_sel) == 0) 
						|| (strcmp("OVER", aperture_sel) == 0) 
						|| (strcmp("UNDER", aperture_sel) == 0))) {
					switch (selection_counter) {
						case 1: { /* Exposure selected */
							selection_counter += 1;

										n_aperture
									)]
								);
								menu_driver(aperture_menu, REQ_DOWN_ITEM);
								menu_driver(aperture_menu, REQ_UP_ITEM);
								wrefresh(aperture_win);
							}
							/* clear the selections for next time */
							/* Clear the selections for next time */
							strcpy(iso_sel, "");
							strcpy(shutter_sel, "");
							strcpy(aperture_sel, "");
							/* And set defaults back to start */
							selection_counter = 1;
							menu_counter = 1;
							menu = &exposure_menu;
							win = &exposure_win;
							move(LINES - 2, 0);
							clrtoeol();
							mvprintw(LINES - 2, 0, "Select EV");
							refresh();
						}
						break;
					}
				}
				/* If over/under need to clear selection so know which is blank
				/* If over/under need to clear selection so know which is blank when a proper selection is made */
				 * when a proper selection is made */
				if ((strcmp("OVER", shutter_sel) == 0) || (strcmp("UNDER", shutter_sel) == 0)) {
					strcpy(shutter_sel, "");
				}
				if ((strcmp("OVER", aperture_sel) == 0) || (strcmp("UNDER", aperture_sel) == 0)) {
					strcpy(aperture_sel, "");
				}
			}

			break;
		case 4:
			strncpy(array_value_str, aperture_array[1]+2, 4);
			array_value_db = strtod(array_value_str, NULL);
			break;
	}
	diff = fabs(array_value_db - x);
	/* lots of repetition here but pointers to arrays seem to be a bad thing */
	/* Lots of repetition here but pointers to arrays seem to be a bad thing */
	/* Could do from n = 3 (2 above) until != under/over
	 * but also need to do something like if diff is more than twice max/min then under/over */
	switch(menu) {
		case 3:
			for ( n = 2; n < n_array-2; ++n ) {
				array_value_db = fraction_to_double(shutter_array[n]);
				if (fabs(array_value_db - x) < diff) {
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
			/* Check if at extremities and then if under/over exposed */
			if (diff_idx == 1) {
				if (diff >= fraction_to_double(shutter_array[1])/2) { /* diff is greater than diff of next one down minus max/min */
				if (diff >= fraction_to_double(shutter_array[1])/2) { 
					/* diff is greater than diff of next one down minus max/min */
					diff_idx = 0;
				}
			}
			if (diff_idx == n_array-3) {
				if (diff >= fraction_to_double(shutter_array[n_array-3])*2) {
					diff_idx = n_array-2;	
				}

					diff = fabs(array_value_db - x);
				}
			}
			/* Apertures similarly. Although progression is fiddlier.*/
			if (diff_idx == 1) {
				strncpy(array_value_str, aperture_array[1]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (diff >= array_value_db/sqrt(2.0)) { /* diff is greater than diff of next one down minus max/min */
				if (diff >= array_value_db/sqrt(2.0)) {
					/* diff is greater than diff of next one down minus max/min */
					diff_idx = 0;
				}
			}
			if (diff_idx == n_array-3) {
				strncpy(array_value_str, aperture_array[n_array-3]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (diff >= array_value_db*sqrt(2.0)) {