Determine Color of a Chessboard Square

给一个国际象棋的板子, 问某个个子的颜色.

class Solution {
    public boolean squareIsWhite(String c) {
        boolean res = (c.charAt(0) - 'a') % 2 == 0 ? false : true ;
        res = (c.charAt(1) - '1') % 2 == 0 ? res : !res;
        return res;
    }
}