Program Mencari Determinan Menggunakan Kofaktor

/*
 * Matriks.java
 *
 * Created on January 23, 2011, 4:28 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

/**
 *
 * @author Mr. Miscall
 */
public class Matriks {
 protected int baris;
 protected int kolom;
 protected double[][] nilai;
 
 /*constructor -- Nilai dari matriks diset nol*/
        public Matriks(int baris, int koloms) {
  if (baris <= 0 || koloms <= 0) throw new IndexOutOfBoundsException();
  this.baris = baris;
  this.kolom = koloms;
  this.nilai = new double[baris][koloms];
  this.zero();
 }
 
 /*Full constructor -- Nilai dari matriks diset sesuai dengan nilai yang diberikan*/
        public Matriks(int baris, int koloms, double[][] nilai) {
  this(baris, koloms);
  this.set(nilai);
 }
        
        /*Prosedure Membuat Matriks Nol*/
 public void zero() {
  for (int i = 0; i < this.baris; i++) {
   for (int j = 0; j < this.kolom; j++) {
    this.nilai[i][j] = 0;
   }
  }
 }
        
        /*Prosedure Menset Nilai Matriks*/
 public void set(double[][] nilai) {
  if (nilai == null) return;
  int baris = nilai.length;
  if (baris == 0) return;
  for (int i = 0; i < baris && i < this.baris; i++) {
   double[] row = nilai[i];
   if (row != null) {
    int kolom = row.length;
    if (kolom != 0) {
     kolom = kolom > this.kolom ? this.kolom : kolom;
     System.arraycopy(row, 0, this.nilai[i], 0, kolom);
    }
   }
  }
 }
        
        /*Fungsi Mengambil SubMatriks*/
        public Matriks getSubMatriks(int row, int col) throws IndexOutOfBoundsException {
  if (this.baris == 1 && row == 0) throw new IndexOutOfBoundsException();
  if (this.kolom == 1 && col >= 0) throw new IndexOutOfBoundsException();
  
  int nRows = (row >= this.baris || row < 0) ? this.baris : this.baris - 1;
  int nCols = (col >= this.kolom || col < 0) ? this.kolom : this.kolom - 1;
  
  int a = 0;
  int b = 0;
  
  Matriks m = new Matriks(nRows, nCols);
  
  for (int i = 0; i < baris; i++) {
   if (i != row) {
    for (int j = 0; j < kolom; j++) {
     if (j != col) {
      m.nilai[a][b] = this.nilai[i][j];
      b++;
     }
    }
    a++;
    b = 0;
   }
  }
  return m;
 }
        
        /*Fungsi Rekursif Mencari Determinan Metode Cofactor*/
        public double determinant(){
  //untuk matriks bukan persegi
  if (this.baris != this.kolom) {System.out.print("Tidak bisa!! Jumlah baris harus sama dengan jumlah kolom."); return 0;}
  
  //untuk matriks 1x1
  if (this.baris == 1) return this.nilai[0][0];
  
  //untuk matriks 2x2
  if (this.baris == 2) return this.nilai[0][0] * this.nilai[1][1] - this.nilai[0][1] * this.nilai[1][0];
  
                //untuk matriks 3x3 ke atas
  double det = 0;
  for (int i = 0; i < baris; i++) {
   det += (i % 2 == 0 ? 1 : -1) * this.nilai[i][0] * this.getSubMatriks(i, 0).determinant();
  }
  return det;
 }
 
        public void cetakIsiMatriks() {
            System.out.println("Matriks =");
            for(int i=0; i < this.baris; i++){
                for(int j=0; j < this.kolom; j++){
                    System.out.print(this.nilai[i][j]+" ");
                }
                System.out.println();
            }
 }
        
 public static void main(String[] args){
            Matriks a = new Matriks(1, 1, new double[][] {{1}});
            a.cetakIsiMatriks();
            System.out.println("Determinan = "+a.determinant());
  
            Matriks b = new Matriks(2, 2, new double[][] {{1, 3}, {1, 1}});
            b.cetakIsiMatriks();
            System.out.println("Determinan = "+b.determinant());
  
            Matriks c = new Matriks(2, 1, new double[][] {{1}, {2}});
            c.cetakIsiMatriks();
            System.out.println("Determinan = "+c.determinant());
                
            Matriks d = new Matriks(3, 3, new double[][] {{1, 3, 1}, {1, 1, 2}, {2, 3, 4}});
            d.cetakIsiMatriks();
            System.out.println("Determinan = "+d.determinant());
            
            Matriks e = new Matriks(5, 5, new double[][] {{1, 1, 1, 1, 1}, {1, 2, 1, 2, 1}, {2, 3, 4, 3, 1}, {1, 1, 7, 5, 1},{1, 1, 1, 5, 1}});
            e.cetakIsiMatriks();
            System.out.println("Determinan = "+e.determinant());
    }
}

Sad

All the word f*ck, sh*t, assh*le, d*mn, s*ck, and its friends are said when somebody is in bad mood. And now I do. I don't understand why I was angry with. What is called friends when they pretend not to know. I don't want this life ever. :(

Konversi Angka ke Bilangan Romawi

/*
 * konversiToRomawi.java
 *
 * Created on January 4, 2011, 10:06 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

/**
 *
 * @author Mr. Miscall
 */

import javax.swing.JOptionPane;

public class konversiToRomawi
{
    public static void konversi(int angka)
    {
        int i;
        char romawi[]={'I','V','X','L','C','D','M'};
        
        if(angka>=1&&angka<5)
        {
            if(angka==4) System.out.print(romawi[0]+""+romawi[1]);
            else for(i=0;i        }
        else if(angka>=5&&angka<10)
        {
            if(angka==9) System.out.print(romawi[0]+""+romawi[2]);
            else
            {
                System.out.print(romawi[1]);
                if(angka!=5) konversi(angka-5);
            }
        }
        else if(angka>=10&&angka<50)
        {
            if(angka>=40)
            {
                System.out.print(romawi[2]+""+romawi[3]);
                if(angka>40) konversi(angka-40);
            }
            else
            {
                if(angka%10==0) for(i=0;i                else
                {
                    System.out.print(romawi[2]);
                    konversi(angka-10);
                }
            }
        }
        else if(angka>=50&&angka<100)
        {
            if(angka>=90)
            {
                System.out.print(romawi[2]+""+romawi[4]);
                if(angka>90) konversi(angka-90);
            }
            else
            {
                System.out.print(romawi[3]);
                if(angka!=50) konversi(angka-50);
            }
        }
        else if(angka>=100&&angka<500)
        {
            if(angka>=400)
            {
                System.out.print(romawi[4]+""+romawi[5]);
                if(angka>400) konversi(angka-400);
            }
            else
            {
                if(angka%100==0) for(i=0;i                else
                {
                    System.out.print(romawi[4]);
                    konversi(angka-100);
                }
            }
        }
        else if(angka>=500&&angka<1000)
        {
            if(angka>=900)
            {
                System.out.print(romawi[4]+""+romawi[6]);
                if(angka>900)konversi(angka-900);
            }
            else
            {
                System.out.print(romawi[5]);
                if(angka!=500) konversi(angka-500);
            }
        }
        else if(angka>=1000&&angka<5000)
        {
            if(angka%1000==0) for(i=0;i            else
            {
                System.out.print(romawi[6]);
                konversi(angka-1000);
            }
        }
        
        else System.out.print(""); //untuk angka>=5000, karena keterbatasan  
        //compiler dalam menampilkan character unicode, maka tidak bisa ditampilkan
}

    
    public static void main(String[] args)
    {
        int x;
        String input;
        
        do
        {
            input = JOptionPane.showInputDialog(null,"Masukkan bilangan [1-5000]= ","Input Dialog",JOptionPane.QUESTION_MESSAGE);
            x = Integer.parseInt(input);
            if(x<1||x>=5000)
            {
                JOptionPane.showMessageDialog(null,"Maaf, input anda di luar batas range. Harap input ulang","Pesan Error",JOptionPane.INFORMATION_MESSAGE);
            }
        }
        while(x<1||x>=5000);
        
        System.out.print("Angka = "+x);
        System.out.print("\nBilangan romawi = ");
        konversi(x);
    }
}