getch () function returns two keycodes for arrow keys. Arrow put to getch '\033'

and '[' and letter from A to D (up, down, right, left) so code will be something like:

if (getch() == '\033')  { 
    getch(); // [ value
    switch(getch())
    { 
        case 'A':
            // your code
        case 'B':
            // your code
        case 'C':
            //your code
        case 'D':
            //your code
    }
}