VMware coding Challenge：Date of Weekday

这道题再次证明了这种细节的题目，画个图容易搞清楚

 import java.util.Scanner;

 public class Solution2 {
     static int DateOfWeekday(int date, int weekday) {
         int cur = date%7;
         int res = 0;
         int dif = 0;
         if (weekday > 0) {
             dif = 7*((weekday-1)/7) + (weekday%7-cur>0? weekday%7-cur : 7-(cur-weekday%7));
             res = date + dif;
         }
         else if (weekday < 0){
             weekday = Math.abs(weekday);
             dif = 7*((weekday-1)/7) + (cur-weekday%7>0? cur-weekday%7 : 7-(weekday%7-cur));
             res = date - dif;
         }
         else res = date;
         return res;
     }

     public static void main(String[] args) {
         Scanner in = new Scanner(System.in);
         int res;
         int _date;
         _date = Integer.parseInt(in.nextLine());

         int _weekday;
         _weekday = Integer.parseInt(in.nextLine());

         res = DateOfWeekday(_date, _weekday);
         System.out.println(res);
     }

 }

     static int DateOfWeekday(int date, int weekday) {
         int cur = date % 7;
         int res;
         if (weekday == 0) return date;
         else if (weekday > 0) {
             if (weekday % 7 > cur) res = date + weekday % 7 - cur;
             else res = date + 7 - (cur - weekday % 7);
             res = res + 7*((weekday-1)/7);
         }
         else {
             if (Math.abs(weekday % 7)<cur) res= date - cur - weekday % 7;
             else res = date - 7 - cur - weekday%7;
             res = res - 7*((Math.abs(weekday)-1)/7);
         }
         return res;
     }