/**
* 编写程序，计算2013年的某月某日是当年的第多少天？是星期几？已知2013年元旦是星期二。
*/
import java.util.Scanner;
public class Date {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.println("请输入年：");
int year=input.nextInt();
System.out.println("请输入月：");
int month=input.nextInt();
System.out.println("请输入日：");
int day=input.nextInt();
int days=0;
int monthDay=0;
int allDay=0; if (year <= 0 || month <= 0 || month > 12 || day <= 0 || day > 31) {
System.out.println("输入错误，请重新输入！"); }else{
if(month==1){
allDay=day;
} else{
for (int i = 1; i < month; i ++) {
switch (i) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days = 31;
break;
case 4:
case 6:
case 9:
case 11:
days = 30;
break;
case 2:
if ((year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0))) {
days = 29;
} else{
days = 28;
}
break;
}
monthDay =monthDay+days;
}
}
allDay=monthDay+day;
System.out.println(year +"年 "+month+"月"+day+"日是这一年的第" +allDay+"天。");
int x=(allDay+1)%7;
if(x==0){
System.out.println(year +"年" +month+ "月"+ day+ "日是这一年的星期天" );
}else {
System.out.println(year +"年" +month+ "月"+ day+ "日是这一年的星期"+x );
}
}
}
}