c++ - Where should refresh() be using ncurses? -

my code below outputs nothing when starts. prints following when type 1,2,3:

1enter value of argv[1]:49 2enter value of argv[2]:50 3enter value of argv[3]:51 

i quite confused refresh() should placed when using loop. trying achieve comments inside loop.

int main() {     initscr();     int argv[3];     int argvlen = sizeof(argv)/sizeof(*argv);      (int i=0; i<argvlen; i++)     {         int n = getch();         printw("enter value of argv[%d]: %d \n", i+1, n);         argv[i] = n;         refresh();          //cout << "enter value of argv[" << i+1 << "]:" << endl;         //cin >> argv[i];     }      endwin();     return 0; } 

getch() returns char, such '1', '2' or '3'. integer values of these 49, 50, 51. if need integer value, should subtract '0'.

int n = getch() - '0'; 

beware works digits (0 9). if enter else won't give expected answer, want add additional checks there.