Use an array to represent a huge number

/**

*

*/

Package homework;

 

Import javax. Swing. joptionpane;

 

/**

* @ Author Administrator

*

*/

Public class hugeinteger {// represents a class

Private int array [] = new int [40];

Private Boolean signed = false; // symbol

 

Public hugeinteger (){

For (INT I = 0; I <array. length; I ++ ){

Array [I] = 0;

}

}

 

Public hugeinteger (INT [] setarray ){

For (INT I = 0; I <setarray. length; I ++ ){

Array [I] = setarray [I];

}

}

 

Public void input (){

String int;

Char chararray [] = new char [array. Length];

Stringbuffer buffer;

 

For (INT I = 0; I <chararray. length; I ++ ){

Chararray [I] = '0 ';

}

 

Int = joptionpane. showinputdialog ("Please input the hugeinteger :");

Buffer = new stringbuffer (INT );

Buffer. Reverse (); // reverse order, adjust high

 

Buffer. getchars (0, buffer. Length (), chararray, 0 );

For (INT I = 0; I <chararray. length; I ++ ){

Array [I] = chararray [I]-48; // converts a char to an int

}

}

 

Public String output (){

String outputstring = "";

Boolean Type = false; // It is used to mark 0 at a high level.

 

// Outputstring + = "The hugeinteger is :";

If (Signed)

Outputstring + = "-";

For (INT I = array. Length-1; I> = 0; I --){

If (array [I]! = 0 ){

Outputstring + = array [I];

Type = true;

} Else if (type)

Outputstring + = array [I]; // do not output a high 0

}

 

Return outputstring;

}

 

Public hugeinteger add (hugeinteger huge ){

Int temparray [] = new int [40];

Int n = 0;

 

For (INT I = 0; I <array. length; I ++ ){

N = array [I] + huge. array [I] + temparray [I];

If (n> = 10 ){

Temparray [I + 1] + = 1; // carry

N = N-10;

}

 

Temparray [I] = N;

}

 

Return new hugeinteger (temparray );

}

 

Public hugeinteger sbstact (hugeinteger huge ){

Int result [] = new int [40];

 

If (isgreaterthan (huge ))

For (INT I = 0; I <array. length; I ++ ){

If (array [I]

Array [I + 1] --;

Array [I] + = 10;

}

 

Result [I] = array [I]-huge. array [I];

}

Else {

Signed = true;

For (INT I = 0; I <array. length; I ++ ){

If (array [I]> huge. array [I] & I <array. Length-1 ){

Huge. array [I + 1] --;

Huge. array [I] + = 10;

}

 

Result [I] = huge. array [I]-array [I];

}

}

 

Return new hugeinteger (result );

}

 

Public Boolean isgreaterthan (hugeinteger huge ){

For (INT I = array. Length-1; I> = 0; I --){

If (array [I]

Return false;

}

 

Return true;

}

 

Public Boolean isrelative to (hugeinteger huge ){

For (INT I = 0; I <array. length; I ++ ){

If (array [I]! = Huge. array [I])

Return false;

}

 

Return true;

}

 

Public Boolean iszero (){

For (INT I = 0; I <array. length; I ++ ){

If (array [I]! = 0)

Return false;

}

 

Return true;

}

}

/*****/Package homework; import javax. swing. joptionpane;/*** @ author administrator ***/public class hugeintegertest {/*** @ Param ARGs */public static void main (string [] ARGs) {// todo auto-generated method stubhugeinteger hugeinteger1 = new hugeinteger (); hugeinteger hugeinteger2 = new hugeinteger (); hugeinteger resulthugeinteger = new hugeinteger (); string output = ""; hugeinteger1.input (); hugeinteg Er2.input (); Output + = "hugeinteger1 is:" + hugeinteger1.output () + "/nhugeinteger2 is:" + hugeinteger2.output (); resulthugeinteger = hugeinteger1.add (hugeinteger2 ); output + = "/nhugeinteger1 + hugeinteger2 =" + resulthugeinteger. output (); resulthugeinteger = hugeinteger1.sbstact (hugeinteger2); Output + = "/nhugeinteger1-hugeinteger2 ="; if (! Hugeinteger1.isgreaterthan (hugeinteger2) Output + = "-"; Output + = resulthugeinteger. output (); joptionpane. showmessagedialog (null, output, "hugeinteger test", joptionpane. information_message );}}