Create 9. Leap years, part 2 (two-part exercise)

Week 2: Methods, strings and lists/9. Leap years, part 2 (two-part exercise)

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+1. First, write the method
+
+public static boolean isLeapYear(int year)
+
+...which returns true or false depending on whether the given year is a leap year or not.
+A year is a leap year if it is evenly divisible by four. 
+However, a year divided by 100 is a leap year only if it is also divided by 400. 
+So, for example, 2000 and 2004 are leap years, but 1900 is not.
+
+
+
+2. After that, write the method
+
+public static void leapYears()
+
+...which asks the user to enter the start and end of the year. 
+The method then prints all leap years found between these years. 
+Make use of the method isLeapYear!
+
+
+Example on method execution:
+Give start: 1970
+Give end: 1977
+1972 is a leap year
+1976 is a leap year
+
+
+
+
+
+
+
+
+
+import java.util.Random;
+import java.util.Scanner;
+
+
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        leapYears();
+    }
+
+
+    // ADDED 1
+    public static boolean isLeapYear(int year){
+        if (year % 4 == 0) {
+            // divided by 100
+            if (year % 100 == 0) {
+                // divided by 400
+                if (year % 400 == 0) {
+                    return true;
+                }
+                return false;
+            }
+            // normal leap year, divided by 4
+            else {
+                return true;
+            }
+        }
+        // not a leap year
+        return false;
+    }
+    
+
+    // ADDED 2
+    public static void leapYears() {
+        Scanner reader= new Scanner(System.in);
+
+        System.out.print("Give start: ");
+        int start = Integer.valueOf(reader.nextLine());
+        System.out.print("Give end: ");
+        int end = Integer.valueOf(reader.nextLine());
+
+        for (int i = start; i <= end; i++) {
+            if (isLeapYear(i)) {
+                System.out.println(i + " is a leap year");
+            }
+        }
+    }
+
+}
+
+
+
+
+
+Testing method isLeapYear...
+Testing with parameter 1984
+Is a leap year: true
+
+Testing with parameter 1985
+Is a leap year: false
+
+Testing with parameter 1900
+Is a leap year: false
+
+Testing with parameter 2000
+Is a leap year: true
+
+Testing with parameter 2004
+Is a leap year: true
+
+Testing with parameter 2003
+Is a leap year: false
+
+Testing method leapYears...
+Testing with input 1970, 1990
+Give start: 1970
+Give end: 1990
+1972 is a leap year
+1976 is a leap year
+1980 is a leap year
+1984 is a leap year
+1988 is a leap year
+
+Testing with input 1780, 1801
+Give start: 1780
+Give end: 1801
+1780 is a leap year
+1784 is a leap year
+1788 is a leap year
+1792 is a leap year
+1796 is a leap year
+
+Testing with input 2001, 2015
+Give start: 2001
+Give end: 2015
+2004 is a leap year
+2008 is a leap year
+2012 is a leap year
+
+Testing with input 1897, 1905
+Give start: 1897
+Give end: 1905
+1904 is a leap year
+
+
+
+
+