PROJECT JAVA ~ Unlimited digits withno BIGINT

MAIN CLASS

big digits

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package recursif;

import java.util.Scanner;


/**
 * 
 * @agintageniusa
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here

        logics G = new logics();
        Scanner input = new Scanner(System.in);

        System.out.println("Masukkan Bilangan Pertama: ");
        String number1 = input.nextLine();
        String x = number1;
        if (x.length() > 2000) {
             return;
        }

        System.out.println("Masukkan Bilangan Kedua: ");
        String number2 = input.nextLine();
        String y = number2;
        if (y.length() > 2000) {
             return;
        }


        System.out.println(" MENU ");

        System.out.println("1. Penambahan");
        System.out.println("2. Pengurangan");
        System.out.println("*******************************");
        System.out.println("Masukkan Nomor Pilihan :");
        int pil = input.nextInt();

        System.out.println(" nomor pilihan " +   pil);
        System.out.println("Hasil perhitungan :  ");

        if (pil == 1) {
            G.tambah(x, y);
        }

        if (pil == 2) {
            G.minus(x, y);
        }
    }
}





LOGICS CLASS

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package recursif;

/**
 * @author agintageniusa/part meat
 */
class logics {

    private String x, y, hasilpenambahan, hasilpengurangan;

    //constructor
    public logics() {
        hasilpenambahan = "";
        hasilpengurangan = "";
    }

    //set x
    public void setX(String a) {
        x = a;
    }

    //return x
    public String getX() {
        return x;
    }

    //set y
    public void setY(String b) {
        y = b;
    }

    //return y
    public String getY() {
        return y;
    }

    //set hasilpenambahan
    public void sethasilpenambahan(String a, String b) {
        x = a;
        y = b;
        return;
    }

    //return hasilpenambahan
    public String gethasilpenambahan() {
        return hasilpenambahan;
    }

    //set hasilpengurangan
    public void sethasilpengurangan(String a, String b) {
        x = a;
        y = b;
        return;
    }

    //return hasilpengurangan
    public String gethasilpengurangan() {
        return hasilpengurangan;
    }

    //menghitung x ditambah y
    public void tambah(String x, String y) {
        int max = 0;
        int carry = 0;
        int zeros = 0;
        int jumlah;

        //Menghitung selisih digit dengan asumsi x terbesar
        if (x.length() > y.length() || x.length() == y.length()) {
            max = x.length();
            zeros = max - y.length();
            for (int i = 0; i < zeros; i++) {
                y = "0" + y;

            }
        }
        //Menghitung selisih digit dengan asumsi y terbesar
        if (y.length() > x.length()) {
            max = y.length();
            zeros = max - x.length();
            for (int i = 0; i < zeros; i++) {
                x = "0" + x;
            }
        }

        for (int i = max - 1; i > -1; i--) {
            String str1 = String.valueOf(x.charAt(i));
            String str2 = String.valueOf(y.charAt(i));

            int a = Integer.parseInt(str1);
            int b = Integer.parseInt(str2);
            jumlah = a + b + carry;

            String sum = String.valueOf(jumlah);
            if (sum.length() == 2) {
                hasilpenambahan = sum.charAt(1) + hasilpenambahan;
                carry = 1;
            } else {
                carry = 0;
                hasilpenambahan = sum + hasilpenambahan;
            }
        }
        if (carry == 1) {
            hasilpenambahan = 1 + hasilpenambahan;

        }
        System.out.println(gethasilpenambahan());

    }

    //menghitung x - y
    public void minus(String x, String y) {

        int max = 0;
        int carry = 0;
        int zeros = 0;
        int minus = 0;


        //jika digit x > a digit y
        if (x.length() > y.length()) {
            max = x.length();
            zeros = max - y.length();
            for (int i = 0; i < zeros; i++) {
                y = "0" + y;
            }

            for (int i = max - 1; i > -1; i--) {
                String str1 = String.valueOf(x.charAt(i));
                String str2 = String.valueOf(y.charAt(i));

                int a = Integer.parseInt(str1);
                int b = Integer.parseInt(str2);
                if (a > b || a == b) {
                    minus = a - b + carry;
                    carry = 0;
                } else {
                    minus = 10 + a - b;
                    carry = -1;
                }
                String kurang = String.valueOf(minus);
                hasilpengurangan = kurang + hasilpengurangan;
            }
            if (hasilpengurangan.equals("")) {
                hasilpengurangan = "0";
            }
            System.out.println(gethasilpengurangan());

        } //jika digit x <  digit y
        else if (x.length() < y.length()) {
            max = y.length();
            zeros = max - x.length();
            for (int i = 0; i < zeros; i++) {
                x = "0" + x;

            }
            for (int i = max - 1; i > -1; i--) {
                String str1 = String.valueOf(y.charAt(i));
                String str2 = String.valueOf(x.charAt(i));

                int a = Integer.parseInt(str1);
                int b = Integer.parseInt(str2);
                if (a > b || b == a) {
                    minus = a - b + carry;
                    carry = 0;
                } else {
                    minus = 10 + a - b;
                    carry = -1;
                }
                String kurang = String.valueOf(minus);
                hasilpengurangan = kurang + hasilpengurangan;
            }

            System.out.println("-" + gethasilpengurangan());
        } //jika digit x = digit y
        else {
            //jika nilai x > dari pada y
            max = x.length();
            String str1 = String.valueOf(x.charAt(0));
            String str2 = String.valueOf(y.charAt(0));
            int a = Integer.parseInt(str1);
            int b = Integer.parseInt(str2);
            if (a > b || a == b) {
                for (int i = max - 1; i > -1; i--) {
                    String str3 = String.valueOf(x.charAt(i));
                    String str4 = String.valueOf(y.charAt(i));
                    int c = Integer.parseInt(str3);
                    int d = Integer.parseInt(str4);
                    if (c > d || a == b) {
                        minus = c - d + carry;
                        carry = 0;

                    } else {
                        minus = 10 + c - d;
                        carry = -1;
                    }
                    String kurang = String.valueOf(minus);
                    hasilpengurangan = kurang + hasilpengurangan;
                }
                String banding = "0";
                for (int i = 0; i <= max - 2; i++) {
                    banding += 0;
                }
                if (banding == null ? hasilpengurangan == null : banding.equals(hasilpengurangan)) {
                    System.out.println("0");
                } else {
                    System.out.println(gethasilpengurangan());
                }
            } else {
                for (int i = max - 1; i > -1; i--) {
                    String str3 = String.valueOf(y.charAt(i));
                    String str4 = String.valueOf(x.charAt(i));
                    int c = Integer.parseInt(str3);
                    int d = Integer.parseInt(str4);
                    if (c > d || c == d) {
                        minus = c - d + carry;
                        carry = 0;

                    } else {
                        minus = 10 + c - d;
                        carry = -1;
                    }
                    String kurang = String.valueOf(minus);
                    hasilpengurangan = kurang + hasilpengurangan;
                }
                System.out.println("-" + gethasilpengurangan());
            }
        }


    }
}



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