チュートリアルでcursesライブラリを学習していますが、cursesチュートリアルでスイッチステートメントを複数のif（スイッチ部分はまだ解説にあります）に置き換えました.ifステートメントでよりよく理解できるので、キーを押すたびに前の新しいキーの前にキーが使用されています。何が問題なのですか?
int main(int argc, char *argv[])
{WINDOW *my_win;
int startx, starty, width, height;
int ch;
initscr();/* Start curses mode */
cbreak();/* Line buffering disabled, Pass on
* everty thing to me */
keypad(stdscr, TRUE);/* I need that nifty F1 */
height = 3;
width = 12;
starty = (LINES - height) / 2;/* Calculating for a center placement */
startx = (COLS - width) / 2;/* of the window*/
printw("Press F1 to exit");
refresh();
my_win = create_newwin(height, width, starty, startx);
/*
while((ch = getch()) != KEY_F(1))
{switch(ch)
{case KEY_LEFT:
destroy_win(my_win);
my_win = create_newwin(height, width, starty,--startx);
break;
case KEY_RIGHT:
destroy_win(my_win);
my_win = create_newwin(height, width, starty,++startx);
break;
case KEY_UP:
destroy_win(my_win);
my_win = create_newwin(height, width, --starty,startx);
break;
case KEY_DOWN:
destroy_win(my_win);
my_win = create_newwin(height, width, ++starty,startx);
break;
}
}
*/
while(42)
{
ch = getch();
if(ch == KEY_LEFT)
{
destroy_win(my_win);
my_win = create_newwin(height, width, starty,startx--);
}
else if(ch == KEY_RIGHT)
{
destroy_win(my_win);
my_win = create_newwin(height, width, starty,startx++);
}
else if(ch == KEY_UP)
{
destroy_win(my_win);
my_win = create_newwin(height, width, starty--,startx);
}
else if(ch == KEY_DOWN)
{
destroy_win(my_win);
my_win = create_newwin(height, width, starty++, startx);
}
else
{
endwin();
exit(0);
}
}
endwin();/* End curses mode */
return 0;
}
WINDOW *create_newwin(int height, int width, int starty, int startx)
{WINDOW *local_win;
local_win = newwin(height, width, starty, startx);
box(local_win, 0 , 0);/* 0, 0 gives default characters
* for the vertical and horizontal
* lines*/
wrefresh(local_win);/* Show that box */
return local_win;
}
void destroy_win(WINDOW *local_win)
{
/* box(local_win, ' ', ' '); : This won't produce the desired
* result of erasing the window. It will leave it's four corners
* and so an ugly remnant of window.
*/
wborder(local_win, ' ', ' ', ' ',' ',' ',' ',' ',' ');
/* The parameters taken are
* 1. win: the window on which to operate
* 2. ls: character to be used for the left side of the window
* 3. rs: character to be used for the right side of the window
* 4. ts: character to be used for the top side of the window
* 5. bs: character to be used for the bottom side of the window
* 6. tl: character to be used for the top left corner of the window
* 7. tr: character to be used for the top right corner of the window
* 8. bl: character to be used for the bottom left corner of the window
* 9. br: character to be used for the bottom right corner of the window
*/
wrefresh(local_win);
delwin(local_win);
}