语句练习题4

 1         Scanner sc2 = new Scanner(System.in);
 2         System.out.println("请输入年份：");
 3         int year=sc2.nextInt();
 4         System.out.println("请输入月份：");
 5         int month=sc2.nextInt();
 6         System.out.println("请输入日期：");
 7         int day=sc2.nextInt();
 8         int zday=0;//定义总天数
 9         boolean isRn;//判断是闰年返回真
10         if((year%4==0&&year%100!=0)||year%400==0){
11             isRn=true;
12         }else{
13             isRn=false;
14         }
15         for(int i=1;i<month;i++){
16             switch(i){
17                 case 1:
18                 case 3:
19                 case 5:
20                 case 7:
21                 case 8:
22                 case 10:
23                 case 12:
24                     zday+=31;
25                     break;
26                 case 2:
27                     if(isRn){
28                         zday+=29;
29                     }else{
30                         zday+=28;
31                     }
32                     break;
33                 case 4:
34                 case 6:
35                 case 9:
36                 case 11:
37                     zday+=30;
38                     break;
39                 default:
40                     System.out.println("月份输入有误，请重新输入！");
41             }
42         }
43         zday+=day;
44         System.out.println(month+"月"+day+"日，是"+year+"年的第"+zday+"天。");