2022年程序设计天梯赛选拔训练题集（7-5 N个数求和）

1.题目详情：

package shanxiligongdaxue;

import java.util.Scanner;

public class TianTiSai3 {//7-3 今天后的第n天是星期几

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int n = sc.nextInt();

        if (n >7) {
            int r = (n) % 7;
            switch (r) {
                case 0:
                    System.out.println(7);
                    break;
                case 1:
                    System.out.println(a + 1);
                    break;
                case 2:
                    System.out.println(a + 2);
                    break;
                case 3:
                    System.out.println(a + 3);
                    break;
                case 4:
                    System.out.println(a + 4);
                    break;
                case 5:
                    System.out.println(a + 5);
                    break;
                case 6:
                    System.out.println(a + 6);

            }
        }

        else if (n<-7){

            int r=Math.abs((n)%7);//
            if(a-r>0) {
                switch (r) {
                    case 0:
                        System.out.println(7);
                        break;
                    case 1:
                        System.out.println(a - r);
                        break;
                    case 2:
                        System.out.println(a - r);
                        break;
                    case 3:
                        System.out.println(a - r);
                        break;
                    case 4:
                        System.out.println(a - r);
                        break;
                    case 5:
                        System.out.println(a - r);
                        break;
                    case 6:
                        System.out.println(a - r);
                }
            }else if (a-r<0){
                System.out.println(a-r+7);
            }
        }else if (n<=7&&n>0&&a+n<=7){
            System.out.println(a+n);
        }else if (n<=7&&n>0&&a+n>7){
            System.out.println((a+n)-7);
        }else if (n==0){
            System.out.println(a);
        }



    }
}