Converting an integer into a BigInteger

[mzjazzygirl]

Norm,

I think I fixed the incompatability issue...

Now I am having trouble w/doing a constant divide. I am trying to use the divideAndRemainder() function, save the remainder, and display it as a character. I have attached the code, and output of where I am stuck.

import java.io.*;
import java.math.*;
import java.util.*;

public class Homework1 {
static BigInteger[] great;
static BigInteger[] key;
static char[] plaintext = new char[1000];
static int count;
static int count1;
static int count2;
static long base = 128;
static BigInteger base2 = BigInteger.valueOf(base);

public static BigInteger readKey() throws IOException
{
FileReader fr1 = new FileReader("key.txt");
BufferedReader br1 = new BufferedReader(fr1);
String line;
count1 = 0;
while((line = br1.readLine()) != null)
{
key[count1] = new BigInteger(line);
//System.out.println("Line... " +line);
count1++;
}
//System.out.println("Let's see... "+ key[0]);
fr1.close();
return key[0];
}

public static void readPlainText() throws IOException
{
FileReader fr2 = new FileReader("plaintext.txt");
BufferedReader br2= new BufferedReader(fr2);
String line1;
String temp;
int temp2[] = new int[10000];
StringBuilder sb = new StringBuilder();
BigInteger code;

count2 = 0;
while((line1 = br2.readLine()) != null)
{
line1.getChars(0, line1.length(), plaintext, 0);
for(int k = 0; k < line1.length(); k++)
{
temp2[count2] = (int)plaintext[k] * 128;
sb.append(temp2[count2]);
count++;
}
}
fr2.close();

BigInteger temp3 = new BigInteger(sb.toString());
code = temp3.multiply(key[0]);

try{
PrintStream out = new PrintStream(new FileOutputStream("encryption.txt"));
out.println(code);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

public static void readBigNumbers(BigInteger temp3) throws IOException
{ FileReader fr = new FileReader("encryption.txt");
BufferedReader br = new BufferedReader(fr);


String line;
//System.out.println("New base from 128, to big integer... "+ base2);
count = 0;
while ((line = br.readLine()) != null)
{ great[count] = new BigInteger(line);
//System.out.println(great[count]);
count++;
}
fr.close();

System.out.println("Test 1... "+great[0]); //Encryption file
System.out.println("Test 2... "+temp3); //Key

BigInteger storage = new BigInteger(great[0].toString());
BigInteger k_temp = new BigInteger(temp3.toString());
//System.out.println("Prelim test..." +storage);
//System.out.println("New prelim test..." +k_temp);

BigInteger storage1[] = storage.divideAndRemainder(k_temp);
BigInteger storage2[] = storage1[0].divideAndRemainder(base2);

System.out.println("This is being shown...");
System.out.println("What is this? "+storage2[1].toString());

*while(storage2[1] != BigInteger.valueOf(0))*
*{*
*System.out.println(storage2[1]);*
*System.out.println("Is this going to show?");*
*storage1[0].divideAndRemainder(base2);*
*}*

System.out.println("Or what about this?");
System.out.println("Quotient... "+storage.divide(k_temp));
/*System.out.println("Integral part... "+storage[1]);
System.out.println("Remainder... "+storage[1]);*/



}

public static void main(String argv[])throws IOException
{ great = new BigInteger[100];
key = new BigInteger[5];
String line;
int selection = 0;
BigInteger temp2;

System.out.println("Please make your selection.\n 1. Encryption \n 2. Decryption\n");
try{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
line = in.readLine();
selection = Integer.parseInt(line);
}
catch (IOException e) {
System.out.println("Unexpected IO Error: " + e);
}
switch(selection) {

case 1:
System.out.println("You have selected Encryption.");
temp2 = readKey();
readPlainText();
System.out.println("The encryption.txt file has been created.");
break;

case 2:
System.out.println("You have selected Decryption.");
temp2 = readKey();
readBigNumbers(temp2);
/* System.out.println("\n Printing from great[] \n");
for (int i = 0; i < count; i++)
System.out.println(great[i].toString());*/
break;
}


System.out.println("\n *** Program Finished *** ");
}

}


Output that I am getting:
Please make your selection.
1. Encryption
2. Decryption

2
You have selected Decryption.
Encryption... 20436095433186426617233657404817259315569049355510 36645458759259730927
3543083039960605160641280
Key... 21574986861247560388341
This is being shown...
What is this? 0 <== This is SUPPOSED to be the division, showing zero
Or what about this?
Quotient... 94721241614720139521344014080129284096947212416126 721369614720142081
4080

*** Program Finished ***

Any assistance would be great.

Thanks!

[mzjazzygirl]

import java.io.*;
import java.math.*;
import java.util.*;

public class Homework1 {
static BigInteger[] great; 
static BigInteger[] key;
static char[] plaintext = new char[1000];
static int count;
static int count1;
static int count2;
static long base = 128;
static BigInteger base2 = BigInteger.valueOf(base);

public static BigInteger readKey() throws IOException
{
FileReader fr1 = new FileReader("key.txt");
BufferedReader br1 = new BufferedReader(fr1);
String line;
count1 = 0;
while((line = br1.readLine()) != null)
{
key[count1] = new BigInteger(line);
//System.out.println("Line... " +line);
count1++;
}
//System.out.println("Let's see... "+ key[0]);
fr1.close();
return key[0];
}

public static void readPlainText() throws IOException
{
FileReader fr2 = new FileReader("plaintext.txt");
BufferedReader br2= new BufferedReader(fr2);
String line1;
String temp;
int temp2[] = new int[10000];
StringBuilder sb = new StringBuilder();
BigInteger code;

count2 = 0;
while((line1 = br2.readLine()) != null)
{
line1.getChars(0, line1.length(), plaintext, 0);
for(int k = 0; k < line1.length(); k++)
{
temp2[count2] = (int)plaintext[k] * 128; 
sb.append(temp2[count2]);
count++;
}
}
fr2.close();

BigInteger temp3 = new BigInteger(sb.toString());
code = temp3.multiply(key[0]);

try{
PrintStream out = new PrintStream(new FileOutputStream("encryption.txt"));
out.println(code);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

public static void readBigNumbers(BigInteger temp3) throws IOException
{ FileReader fr = new FileReader("encryption.txt");
BufferedReader br = new BufferedReader(fr);


String line;
//System.out.println("New base from 128, to big integer... "+ base2);
count = 0;
while ((line = br.readLine()) != null)
{ great[count] = new BigInteger(line);
//System.out.println(great[count]);
count++;
}
fr.close();

System.out.println("Test 1... "+great[0]); //Encryption file
System.out.println("Test 2... "+temp3); //Key

BigInteger storage = new BigInteger(great[0].toString());
BigInteger k_temp = new BigInteger(temp3.toString());
//System.out.println("Prelim test..." +storage);
//System.out.println("New prelim test..." +k_temp);

BigInteger storage1[] = storage.divideAndRemainder(k_temp);
BigInteger storage2[] = storage1[0].divideAndRemainder(base2);

System.out.println("This is being shown...");
System.out.println("What is this? "+storage2[1].toString());

*while(storage2[1] != BigInteger.valueOf(0))*
*{*
*System.out.println(storage2[1]);*
*System.out.println("Is this going to show?");*
*storage1[0].divideAndRemainder(base2);*
*}*

System.out.println("Or what about this?");
System.out.println("Quotient... "+storage.divide(k_temp));
/*System.out.println("Integral part... "+storage[1]);
System.out.println("Remainder... "+storage[1]);*/



}

public static void main(String argv[])throws IOException
{ great = new BigInteger[100];
key = new BigInteger[5];
String line;
int selection = 0;
BigInteger temp2;

System.out.println("Please make your selection.\n 1. Encryption \n 2. Decryption\n");
try{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
line = in.readLine();
selection = Integer.parseInt(line);
}
catch (IOException e) {
System.out.println("Unexpected IO Error: " + e);
}
switch(selection) {

case 1: 
System.out.println("You have selected Encryption.");
temp2 = readKey();
readPlainText();
System.out.println("The encryption.txt file has been created.");
break;

case 2:
System.out.println("You have selected Decryption.");
temp2 = readKey();
readBigNumbers(temp2);
/* System.out.println("\n Printing from great[] \n");
for (int i = 0; i < count; i++)
System.out.println(great[i].toString());*/
break;
}


System.out.println("\n *** Program Finished *** ");
}

}

Output that I am getting:
Please make your selection.
1. Encryption
2. Decryption

2
You have selected Decryption.
Encryption... 20436095433186426617233657404817259315569049355510 36645458759259730927
3543083039960605160641280
Key... 21574986861247560388341
This is being shown...
What is this? 0 <== This is SUPPOSED to be the division, showing zero
Or what about this?
Quotient... 94721241614720139521344014080129284096947212416126 721369614720142081
4080

*** Program Finished ***

[mzjazzygirl]

Output that I am getting:
Please make your selection.
1. Encryption
2. Decryption

2
You have selected Decryption.
Encryption... 20436095433186426617233657404817259315569049355510 36645458759259730927
3543083039960605160641280
Key... 21574986861247560388341
This is being shown...
What is this? 0 <== This is SUPPOSED to be the remainder, showing zero
Or what about this?
Quotient... 94721241614720139521344014080129284096947212416126 721369614720142081
4080

*** Program Finished ***

[DarrylBurke]

Now also on another forum
Java Programming - Problems w/BigIntegers

db

[Fubarable]

Please do not cross-post without informing us. Keep doing this and folks might decide not to help you in the future (here or in other forums). Best of luck.

[mzjazzygirl]

Darrl.Burke and Fubarable,

I am very sorry about the cross-post. I didn't know these two sites were related, or the same.

It will not happen again.

Thank you for your help.

-mzjazzygirl

[Tolls]

They're not related, but it is annoying to answer a question in a forum only to discover that it has already been answered on another forum. Never mind being something of a waste of time.

By the way, is your code normally unformatted like that?

[Tolls]

Have you got very delayed bouncy fingers, Darryl?