Day for given date...

Write a program to accept a date in a specific string format (dd/mm/yyyy) and accept the name of the day on 1st January of the corresponding year. Find the day for the given date.

Example :

Input:          Enter the date ( in dd/mm/yyyy) format: 5/7/2001

Enter the Day on 1st January in this year: Monday

Output:                  5/7/2001 : Thursday

Test run the program on the following inputs.

Input date              Day on 1^st  January                   Output day for Input date

4/941998              Thursday                        Friday

31/8/1998              Friday                                      Tuesday

6/12/2000             Saturday                        Wednesday

The program should include the part for validating the inputs namely the date and the day on 1^st January of the year.

Solution:-

import java.util.*;

class date

{

     int arr[]={31,28,31,30,31,30,31,31,30,31,30,31};

     String str1,day,day1;

     int x,i,dayno,mon,yr,leap1;

     void input()//input date and first day of year.

     {

           Scanner sc=new Scanner(System.in);

           System.out.println("Enter the date (in dd/mm/yyyy) format");

           day=sc.nextLine();

           day1=day;

           i=day.indexOf("/");

           dayno=Integer.parseInt(day.substring(0,i));

           day=day.substring(i+1);

           i=day.indexOf("/");

           mon=Integer.parseInt(day.substring(0,i));

           day=day.substring(i+1);

           yr=Integer.parseInt(day);

           leap1=0;

           if(mon>2)

           leap1=leap(yr);

           System.out.println("Enter the Day on 1st January in this year");

           str1=sc.nextLine();

     }

     int leap(int p)//check for leap year.

     {

           if(p%4==0&&p%100!=0||p%400==0)

                return 1;

           else

                return 0;

     }

     void display()

     {

           if (str1.equalsIgnoreCase("Sunday"))

                x=1;

           else if (str1.equalsIgnoreCase("Monday"))

                x=2;

           else if (str1.equalsIgnoreCase("Tuesday"))

                x=3;

           else if (str1.equalsIgnoreCase("Wednesday"))

                x=4;

           else if (str1.equalsIgnoreCase("Thursday"))

                x=5;

          else if (str1.equalsIgnoreCase("Friday"))

                x=6;

           else if (str1.equalsIgnoreCase("Saturday"))

                x=7;

           for(i=0;i<mon-1;i++)

           {

                dayno=dayno+arr[i];

           }

           dayno=dayno+leap1;

           for(i=0;i< dayno-1;i++)

           {

                 x++;

                 if(x==8)

                      x=1;

           }

           System.out.print(day1+ ":");

           switch(x)

           {

                case 1:System.out.print("Sunday");

                break;

                case 2:System.out.print("Monday");

                break;

                case 3:System.out.print("Tuesday");

                break;

                case 4:System.out.print("Wednesday");

                break;

                case 5:System.out.print("Thursday");

                break;

                case 6:System.out.print("Friday");

                break;

                case 7:System.out.print("Saturday");

                break;

           }

     }

     public static void main(String args[])

     {

           date ob=new date();

           ob.input();

           ob.display();

     }

 }