Nombres cubiques (v1.4)

Nombres_cubiques.java

/**
 * Ce programme calcule les entiers cubiques inférieurs
 * à un entier donné (inférieur à 3000).
 * @author Adrien Tétar
 * @version 1.4
 * 
 * Changelog:
 * 1.4 - reverted 1.2 and 1.3 changes.
 *       added sommeDesCubesDesChiffresS().
 *       added rechercheDesNombresCubiquesS().
 *       rechercheDesNombresCubiques*(): added sum.
 *       merged affConsole*() long + String.
 *       various minor fixes.
 * 1.3 - added convertArrayListStr().
 * 1.2 - added rechercheDesNombresCubiquesI().
 * 1.1 - 'tmp', 'tmp1' cleanup.
 * 
 * Copyright © 2012, Adrien Tétar. All rights reserved.
 */
import javax.swing.JOptionPane;

class Nombres_cubiques
{
	/* Display a value of type String. */
	public static void affConsole(String mot)
	{ 
		System.out.print(mot);
	}
	/* Display a value of type long. */
	public static void affConsole(long nombre)
	{ 
		System.out.print(nombre);
	}
	
	/* Display a value of type String + new line. */
	public static void affConsoleRetourLigne(String mot)
	{ 
		System.out.println(mot);
	}
	/* Display a value of type long + new line. */
	public static void affConsoleRetourLigne(long nombre)
	{ 
		System.out.println(nombre);
	}
	
	/* Display input and convert it to long. */
	public static long saisieLong(String Phrase)
	{
		return Long.parseLong(JOptionPane.showInputDialog(Phrase));
	}
	
	/* ========================================================== */
	
	/* Sum cubic numbers. */
	public static long sommeDesCubesDesChiffres(long n)
	{
		long res = 0;
		do {
			/*
			 * (n - (n/10) * 10) will extract the
			 * last digit.
			 */
			res += (long)Math.pow((n - (n/10) * 10), 3);
			n = (long)Math.floor(n/10);
		} while (n > 0);
		return res;
	}
	
	/* Sum cubic numbers using strings. */
	public static long sommeDesCubesDesChiffresS(long n)
	{
		long res = 0;
		/*
		 * We'll use a String here to extract numbers
		 * easily.
		 */
		String ns = Long.toString(n);
		
		for (int i=0; i<ns.length(); i++)
			/*
			 * Since String uses ASCII code in which:
			 * 0 is 48,
			 * 1 is 49,
			 * ...
			 * We'll subtract 48 to get the real
			 * numeric value.
			 */
			res += (long)Math.pow((ns.charAt(i) - 48), 3);
		return res;
	}
	
	/* Is 'n' cubic ? */
	public static Boolean estCubique(long n)
	{
//		if (n == sommeDesCubesDesChiffres(n))
		if (n == sommeDesCubesDesChiffresS(n))
			return true;
		else
			return false;
	}
	
	/* Find cubic numbers < 'n' and sum them. */
	public static void rechercheDesNombresCubiques(long n)
	{
		affConsoleRetourLigne("Les nombres cubiques " +
				"inférieurs à n sont:");
		
		long sum = 0;
		for (long i=1; i<n; i++)
		{
			if (estCubique(i))
			{
				/*
				 * Add ", " _before_ appending value except
				 * for the first iteration.
				 * cf. stackoverflow.com/questions/285523
				 */
				if (sum > 0)
					affConsole(", ");
				affConsole(i);
				
				sum = sum + i;
			}
		}
		affConsoleRetourLigne(".");
		
		affConsole("La somme de ces nombres fait ");
		affConsole(sum);
		affConsoleRetourLigne(".");
		
		affConsoleRetourLigne("Voilà voilà voilà!");
	}
	
	/* Find cubic numbers < 'n' and sum them, w/String + GUI. */
	public static void rechercheDesNombresCubiquesS(long n)
	{
		String res = "";
		long sum = 0;
		for (long i=0; i<n; i++)
		{
			if (estCubique(i))
			{
				/*
				 * Add ", " _before_ appending value except
				 * for the first iteration.
				 * cf. stackoverflow.com/questions/285523
				 */
				if (res.length() != 0)
					res = res + ", ";
				res = res + i;
				sum = sum + i;
			}
		}
		
		JOptionPane.showMessageDialog(null, "Les nombres cubiques " +
				"inférieurs à " + n + " sont :\n" + res + "." +
				"\nLa somme de ces nombres fait:\n" + sum + ".");
	}
	
	public static void main(String[] args)
	{
		if (JOptionPane.showConfirmDialog(null, "Recherche " +
				"des entiers cubiques inférieurs à un entier" +
				" donné.\n\nVoulez-vous continuer ?", "Confirmation",
				JOptionPane.YES_NO_OPTION) == JOptionPane.NO_OPTION)
		{
			System.exit(0);
		}
		
		long n;
		/*
		 * Setup a loop so that we'll keep asking for 'n' until a
		 * value <3000 is given.
		 */
		do {
			n = saisieLong("Donner un entier n (< 3000):");
		} while ((n >= 3000) || (n < 0));
		
//		rechercheDesNombresCubiques(n);
		rechercheDesNombresCubiquesS(n);
	}
}