输入年、月、日，计算其为星期几

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本文介绍了一个使用Java编写的程序，该程序能够根据输入的年、月、日计算出对应的星期。通过一系列数学公式和条件判断，程序准确地返回了一周中的具体某一天，例如星期六或星期天等。

/*
Enter year:(e.g., 2012): 2015
Enter month: 1-12: 1
Enter the day of the month: 1-31: 25
Day of the week is Sunday.

Enter year:(e.g., 2012): 2012
Enter month: 1-12: 5
Enter the day of the month: 1-31: 12
Day of the week is Saturday.

*/
import java.util.Scanner;

public class DayOfTheWeek {
    public static void main (String[] args) {
        Scanner input = new Scanner(System.in);
        int h, q, m, j, k;
        /******************************************************
         * h: is the day of the week.
         * q: is the day of month.
         * m: is the month.
         * j: is the century.
         * k: is the year of the century.
         ******************************************************/
        System.out.print("Enter year:(e.g., 2012): ");
        j = input.nextInt();        
        System.out.print("Enter month: 1-12: ");
        m = input.nextInt();
        if (m == 1 || m == 2) {
            if (m == 1) 
                m = 13;
            else
                m = 14;
            k = (j - 1) % 100;
            j /= 100;
        }
        else {
            k = j % 100;
            j /= 100;
        }   
        System.out.print("Enter the day of the month: 1-31: ");
        q = input.nextInt();
        h = (q + 26 * (m + 1) / 10 + k + k / 4 + j / 4 + 5 * j) % 7;

        System.out.print("Day of the week is ");
        switch (h) {
            case 0: System.out.println("Saturday.");  break;
            case 1: System.out.println("Sunday.");  break;
            case 2: System.out.println("Monday.");  break;
            case 3: System.out.println("Tuesday."); break;
            case 4: System.out.println("Wednesday.");   break;
            case 5: System.out.println("Thursday.");    break;
            case 6: System.out.println("Friday.");  break;
        }
    }
}