Write a Java program to generate the calendar for the year 2017 (Jan – Dec). The

Question

Write a Java program to generate the calendar for the year 2017 (Jan – Dec). The program should prompt the user to input the year for the calendar of interest. The progam must check for leap years and make the number of days 29 for the month of February. The output must show the year and your week may start on Sunday and end on Saturday. See sample below:

2017 Calendar

January 2017

Sun    Mon   Tue    Wed    Thu    Fri      Sat             

   1    2        3           4          5        6           7      

   8     9       10   11       12     13         14   

15     16      17     18       19     20         21  

22   23        24       25       26       27         28    

29     30        31

Explanation / Answer

import java.util.Scanner;
public class Calender {

public static int day(int month, int day, int year) {
int y = year - (14 - month) / 12;
int x = y + y/4 - y/100 + y/400;
int m = month + 12 * ((14 - month) / 12) - 2;
int d = (day + x + (31*m)/12) % 7;
return d;
}

// check leap year
public static boolean checkLeap(int year) {
if ((year % 4 == 0) && (year % 100 != 0)) return true;
if (year % 400 == 0) return true;
return false;
}

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a year:");
int year= sc.nextInt();

String[] month_names = {
"",   
"January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December"
};

// days_of_month[i] = number of days_of_month in month i
int[] days_of_month = {
0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};

for(int j=0;j<12;j++){
   int month = j;
   // check for leap year
if (month == 2 && checkLeap(year)) days_of_month[month] = 29;
// print header
System.out.println(" " + month_names[month] + " " + year);
System.out.println(" S M Tu W Th F S");

// starting day
int d = day(month, 1, year);

// print the calendar
for (int i = 0; i < d; i++)
System.out.print(" ");
for (int i = 1; i <= days_of_month[month]; i++) {
System.out.printf("%2d ", i);
if (((i + d) % 7 == 0) || (i == days_of_month[month])) System.out.println();
}
System.out.println();
}
}
}

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