ISC 2020 Computer Science Theory Day and Month Program

Design a class Convert to find the date and the month from a given day number for a particular year.

Example: If day number is 64 and the year is 2020, then the corresponding date would be: March 4, 2020 i.e. (31 + 29 + 4 = 64).

Some of the members of the class are given below:

Class name: Convert
Data members/instance variables:
n: integer to store the day number.
d: integer to store the day of the month (date).
m: integer to store the month.
y: integer to store the year.
Methods/Member functions:
Convert(): constructor to initialize the data members with legal initial values.
void accept(): to accept the day number and the year.
void dayToDate(): converts the day number to its corresponding date for a particular year and stores the date in ‘d’ and the month in ‘m’.
void display(): displays the month name, date and year.

Specify the class Convert giving details of the constructor, void accept(), void dayToDate() and void display(). Define a main() function to create an object and call the functions accordingly to enable the task.

import java.io.*;
class Convert{
    int n;
    int d;
    int m;
    int y;
    public Convert(){
        n = 0;
        d = 0;
        m = 0;
        y = 0;
    }
    public void accept()throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Day number: ");
        d = Integer.parseInt(br.readLine());
        System.out.print("Year: ");
        y = Integer.parseInt(br.readLine());
        if((y % 100 == 0 && y % 400 == 0) || y % 4 == 0){
            if(d > 366){
                System.out.println("Invalid day number!");
                System.exit(0);
            }
        }
        else if(d > 365){
            System.out.println("Invalid day number!");
            System.exit(0);
        }
    }
    public void dayToDate(){
        int a[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        if((y % 100 == 0 && y % 400 == 0) || y % 4 == 0)
            a[1] = 29;
        int sum = 0;
        if(d <= 31) m = 0; else{ while(d > 0){
                d -= a[m];
                m++;
                if(d <= a[m])
                    break;
            }
        }
    }
    public void display(){
        String months[] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
        System.out.println(months[m] + " " + d + ", " + y);
    }
    public static void main(String args[])throws IOException{
        Convert obj = new Convert();
        obj.accept();
        obj.dayToDate();
        obj.display();
    }
}

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