Java编程题练习2017-02-18

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2017-02-18题目：输入某年某月某日，判断这一天是这一年的第几天？

import java.util.Scanner;

public class ru20170218 {

public static void main(String[] args) {    // TODO Auto-generated method stub    int y,m,d;      int sum=0;      int feb=28;      Scanner in = new Scanner(System.in);      System.out.print("请输入年份:");      y = in.nextInt();      System.out.print("请输入月份:");      m = in.nextInt();      System.out.print("请输入几号:");      d = in.nextInt();      if((y%4==0 && y%100!=0) || y%400==0)      {          feb = 29;      }      switch(m)          {                  case 1:                      sum = d;                      break;                  case 2:                      sum = 31 + d;                      break;                  case 3:                      sum = 31+feb+d;                      break;                  case 4:                      sum = 31+feb+31+d;                      break;                  case 5:                      sum = 31+feb+31+30+d;                      break;                  case 6:                      sum = 31+feb+31+30+31+d;                      break;                  case 7:                      sum = 31+feb+31+30+31+30+d;                      break;                  case 8:                      sum = 31+feb+31+30+31+30+31+d;                      break;                  case 9:                      sum = 31+feb+31+30+31+30+31+31+d;                      break;                  case 10:                      sum = 31+feb+31+30+31+30+31+31+30+d;                      break;                  case 11:                      sum = 31+feb+31+30+31+30+31+31+30+31+d;                      break;                  case 12:                      sum = 31+feb+31+30+31+30+31+31+30+31+30+d;      }      System.out.println(y+" 年 "+m+" 月 " + d + "号是今年的第"+sum+"天");  }

}

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