杭电ACM2005第几天

第几天？

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 37271    Accepted Submission(s): 14266

Problem Description

给定一个日期，输出这个日期是该年的第几天。

 

Input

输入数据有多组，每组占一行，数据格式为YYYY/MM/DD组成，具体参见sample input ,另外，可以向你确保所有的输入数据是合法的。

 

Output

对于每组输入数据，输出一行，表示该日期是该年的第几天。

 

Sample Input

1985/1/20

2006/3/12

 

Sample Output

20

71

import java.util.Scanner;
public class Main{
    public static boolean isLeapYear(int year){
        if(year%400==0||(year%4==0&&year%100!=0))
            return true;
        else 
            return false;
    }
    public static int getNumberOfDaysInMonth(int year,int month){
        int flag = 0;
        if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
            flag = 31;
        else if(month==2){
            flag = isLeapYear(year)?29:28;
        }
        else if(month==2||month==4||month==6||month==9||month==11) 
            flag =  30;
        return flag;
    }
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int year,month,day = 0;
        int whichday = 0;
        String str = null;
        while(scan.hasNext()){
            str = scan.nextLine();
            String[] date = str.split("/");
            year = Integer.parseInt(date[0]);
            month = Integer.parseInt(date[1]);
            day = Integer.parseInt(date[2]);
            whichday = day;
            for(int i=1;i<month;i++){
                whichday += getNumberOfDaysInMonth(year,i);
            }
            System.out.println(whichday);
        }
    }
}