Question

This question deals with extending already existing Java code via a while loop.

1. Ask the user how many year inputs he wants to check - an integer. Assume that the user always gives an input which is between 1 and 5 (inclusive).
2. Next, ask the user for K number of year inputs where K = the number user has given as input before (inside a while loop).
3. Check for each year input whether that year is a leap year or not (provided code).
   1. Take year input (positive integer - should be between 1500 and 2017, inclusive).
   2. If the year input is not between 1500 and 2017, do not check for leap year, rather print that this year cannot be checked.
   3. If the input year is a leap year, print that year is a leap year; otherwise, print that the year is not a leap year.
   4. make sure to handle the centurial years, i.e., years ending in 00, e.g., 1900, 1800, 1700, 2000, etc.?
4. Copy the provided code and add the while loop on top of that. Use while loop only for this question.

Sample Code Structure

// add necessary import commands

public class main {

public static void main (String[] args){

// create the required variables first.

while (not all inputs have been taken - add this condition here){

//add the provided code.

}

}

}

Sample Output

• How many years do you want to check (must be between 1 and 5)? 2
  What's the year you want to test? (make sure it's between 1500 and 2017): 1400
  This year cannot be checked. Try again!
  What's the year you want to test? (make sure it's between 1500 and 2017): 2016
  Yes, 2016 is a leap year!
  

• How many years do you want to check (must be between 1 and 5)? 3
  What's the year you want to test? (make sure it's between 1500 and 2017): 1400
  This year cannot be checked. Try again!
  What's the year you want to test? (make sure it's between 1500 and 2017): 2016
  Yes, 2016 is a leap year!
  What's the year you want to test? (make sure it's between 1500 and 2017): 2017
  Nope, 2017 is not a leap year!

Provided Code

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

// creating object of Scanner class

Scanner sc = new Scanner(System.in);

// asking user to enter year

System.out.print("What year do you want to test? (Make sure it's between 1500 and 2019!)");

int year = sc.nextInt();// reading year

// checking year

if (year > 1500 && year < 2019) {

// checking leap year

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

// print message when year is leap year

System.out.println(year + " is a leap year!");

} else {

// print message when year is not leap year

System.out.println(year + " is NOT a leap year!");

}

} else {

// print message if invalid year is entered

System.out.println("This year cannot be checked. Try again!");

}

}

}

Answer 1

Source code:

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

// creating object of Scanner class

Scanner sc = new Scanner(System.in);

//asking how many time the user wants to enter years

System.out.print("How many years do you want to check (must be between 1 and 5)?");

int count = sc.nextInt(); //reading number

while(count>0){ //counting how many times user entered

// asking user to enter year

System.out.print("What year do you want to test? (Make sure it's between 1500 and 2019!):");

int year = sc.nextInt();// reading year

// checking year

if (year > 1500 && year < 2019) {

// checking leap year

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

// print message when year is leap year

System.out.println(year + " is a leap year!");

} else {

// print message when year is not leap year

System.out.println(year + " is NOT a leap year!");

}

} else {

// print message if invalid year is entered

System.out.println("This year cannot be checked. Try again!");

}
count--; //decreasing the count value
}
}

}

Output: