Partially done I02

Java/Intermediate_02 exoplanet leap years/.classpath

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

Java/Intermediate_02 exoplanet leap years/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Intermediate_02 exoplanet leap years</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Java/Intermediate_02 exoplanet leap years/src/ExoPlanet.java

@@ -0,0 +1,49 @@
+import java.util.Scanner;
+
+public class ExoPlanet {
+
+	public static void main(String[] args){
+
+		System.out.println("Enter the number of fractions days a year this plant has.\n>> ");
+
+		Scanner Reader = new Scanner(System.in);
+		double days =  Reader.nextDouble();
+		Reader.close();
+
+		ExoPlanet exo = new ExoPlanet(days);
+
+		int yearsPerLeap = exo.calcYearsPer();
+
+		String method = exo.addYear()? "add on" : "take off" ;
+		System.out.println( "A planet with "+ days +
+				" days a year, would need a to " + method + " an extra day every "+
+				yearsPerLeap + " years" );
+	}
+
+	private double days;
+
+	public ExoPlanet(double days) {
+		this.days = days;
+	}
+
+	public int calcYearsPer(){
+
+		int yearsPerLeap = 2;
+		int daysPerYear = (int) Math.floor(this.days);
+
+		while(yearsPerLeap*this.days <= yearsPerLeap*daysPerYear + 1){
+			yearsPerLeap++;
+		}
+
+		return yearsPerLeap-1;
+	}
+
+	public boolean addYear(){
+		if (Math.round(this.days)==Math.floor(this.days)){
+			return true;
+		}
+		else{
+			return false;
+		}
+	}
+}

Java/Intermediate_02 exoplanet leap years/src/ExoPlanet_Test.java

@@ -0,0 +1,70 @@
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class ExoPlanet_Test {
+
+	/*
+	 * Lots of references for space stuff
+	 * https://www.universetoday.com/37507/years-of-the-planets/
+	 * https://en.wikipedia.org/wiki/Planet
+	 * 
+	 * Turns out no one seems to have complied a list of possible leap years
+	 * for all the planets, or at least i couldn't find one.
+	 */
+
+	@Test
+	public void test_calcYearsPer_a() {
+
+		ExoPlanet exo = new ExoPlanet(100.25);
+		assertEquals(4,exo.calcYearsPer());
+	}
+
+	@Test
+	public void test_calcYearsPer_b() {
+
+		ExoPlanet exo = new ExoPlanet(100.33);
+		assertEquals(3,exo.calcYearsPer());
+	}
+
+
+	@Test
+	public void test_calcYearsPer_c() {
+
+		ExoPlanet exo = new ExoPlanet(100.001);
+		assertEquals(1000,exo.calcYearsPer());
+	}
+
+	/*
+	 * REAL PLANET TESTS . . .
+	 */
+
+	// NOTE: Mercury is weird its day is longer than its year
+
+	// NOTE: a year on Venus is 1.92 venusian days
+
+	// NOTE: a year on Earth is 365.2422 days
+	@Test
+	public void test_calcYearsPer_earth() {
+
+		ExoPlanet exo = new ExoPlanet(365.2422);
+		assertEquals(4,exo.calcYearsPer());
+	}
+
+	// NOTE: a year on mars is 668.5991 martian days
+	// a proposed rule is if (year % 2 == 0 || year % 5 == 0)
+
+	// NOTE: a year on Jupiter us 10,475.8 jovian days
+
+	// NOTE: a year on Saturn is 24,491.07 Saturnian days
+	@Test
+	public void test_calcYearsPer_saturn() {
+
+		ExoPlanet exo = new ExoPlanet(24491.07);
+		assertEquals(14,exo.calcYearsPer());
+	}
+
+	// NOTE: a year on Uranus is 42,718 Uranian days
+
+	// NOTE: a year on Neptune is 89,666 Neptunian days
+}

README.md

@@ -47,7 +47,7 @@ I'm using a list of problems from https://adriann.github.io/programming_problems
 **ID**|**Task**|**Java**|**C#**|**python**
 :-----:|:-----|:-----:|:-----:|:-----:
 01| adds up to one hundred | :white_check_mark: | | 
-02| Exo planet leap years | | |
+02| Exo planet leap years | partial | |
 03| implement a data structure for graphs | | |
 04| DOT representation of a graphs | | |
 05| Morse code to english converter | | |