Hi, i need to write a program for a computer science class. The directions my pr

Question

Hi, i need to write a program for a computer science class. The directions my professor gave it very confusing.. he wants a program that can add, subtract, divide, multiply integers upto 500.. heres what he wrote on the board. First day of class he wrote this on the board:

We have to write a program called "BigInt" basically big integer.

only thing he gave us is this:

Create the bigInt class
main class;
b1=b2.add(b3);
you will do both positive and negative

Constructor
BigInt b1 = new BigInt();
BigInt b2= new BigInt ();
BigInt b3 = new BigInt();
+
-
*
/ _____________________________________________________________________________ SECOND DAY OF CLASS: - he wrote this on the board
Class BigInt;
{
int [ ] big Num=newint[1000];
boolean pos; (true or false depends on the number if its positive or negative)
BigInt 1= new BigInt("17163666664563458998654656666666665645");
                                 ("0");
                                 ("+"); (if you get a plus sign than make it a zero)
                                 ("/");
                                 ("136ABC");

the integers can go upto 500 integers.

for addition
b3=b2.add(b1);
system. println("........................+b3);
this is all i know... please help me with this asap.. thank you so much

Hi, i need to write a program for a computer science class. The directions my professor gave it very confusing.. he wants a program that can add, subtract, divide, multiply integers upto 500.. heres what he wrote on the board. First day of class he wrote this on the board:

We have to write a program called "BigInt" basically big integer.

only thing he gave us is this:

Create the bigInt class
main class;
b1=b2.add(b3);
you will do both positive and negative

Constructor
BigInt b1 = new BigInt();
BigInt b2= new BigInt ();
BigInt b3 = new BigInt();
+
-
*
/ _____________________________________________________________________________ We have to write a program called "BigInt" basically big integer.

only thing he gave us is this:

Create the bigInt class
main class;
b1=b2.add(b3);
you will do both positive and negative

Constructor
BigInt b1 = new BigInt();
BigInt b2= new BigInt ();
BigInt b3 = new BigInt();
+
-
*
/ SECOND DAY OF CLASS: - he wrote this on the board
Class BigInt;
{
int [ ] big Num=newint[1000];
boolean pos; (true or false depends on the number if its positive or negative)
BigInt 1= new BigInt("17163666664563458998654656666666665645");
                                 ("0");
                                 ("+"); (if you get a plus sign than make it a zero)
                                 ("/");
                                 ("136ABC");

the integers can go upto 500 integers.

for addition
b3=b2.add(b1);
system. println("........................+b3);
this is all i know... please help me with this asap.. thank you so much

Class BigInt;
{
int [ ] big Num=newint[1000];
boolean pos; (true or false depends on the number if its positive or negative)
BigInt 1= new BigInt("17163666664563458998654656666666665645");
                                 ("0");
                                 ("+"); (if you get a plus sign than make it a zero)
                                 ("/");
                                 ("136ABC");

the integers can go upto 500 integers.

for addition
b3=b2.add(b1);
system. println("........................+b3);
this is all i know... please help me with this asap.. thank you so much

Explanation / Answer

please rate - thanks maybe this will be clearer for you import java.io.*;

public class bigint
{
    public static void main(String argv[]) throws IOException
    {
        BigInteger b1,b2,b3;

        b1 = new BigInteger();
        b2 = new BigInteger();

        System.out.println("input the first BigInteger:");
        b1.inputBigInteger();
        System.out.println("input the second BigInteger:");
        b2.inputBigInteger();

        System.out.print("BigInt #1: "); b1.printBigInteger();
        System.out.print("BigInt #2: "); b2.printBigInteger();
        System.out.println("            =========================");
        b3 = b1.add(b2);
        System.out.print("SUM:        "); b3.printBigInteger();
        System.out.println();

        System.out.print("BigInt #1: "); b1.printBigInteger();
        System.out.print("BigInt #2: "); b2.printBigInteger();
        System.out.println("            =========================");
        b3 = b1.subtract(b2);
        System.out.print("DIFFERENCE: "); b3.printBigInteger();
        System.out.println();

        System.out.print("BigInt #1: "); b1.printBigInteger();
        System.out.print("BigInt #2: "); b2.printBigInteger();
        System.out.println("            =========================");
        b3 = b1.multiply(b2);
        System.out.print("PRODUCT:    "); b3.printBigInteger();
        System.out.println();
    }
}


class BigInteger
{
    private final int INTSIZ=500;
    private int intArray[] = new int[INTSIZ];

    public BigInteger add(BigInteger bi)
    {
        BigInteger bsum = new BigInteger();
        int carry = 0;
        for (int i=INTSIZ-1; i>=0; i--)
        {
            int tmp = intArray[i] + bi.intArray[i] + carry;
            carry = tmp/10;
            bsum.intArray[i] = tmp%10;
        }
        return bsum;
    }
    public BigInteger subtract(BigInteger bi)
    {
        BigInteger bsubtract = new BigInteger();
        int tmpIntArray[] = new int[INTSIZ];
        for(int i=0;i!=INTSIZ;i++){tmpIntArray[i]=intArray[i];}
        int borrow = 0;
        for (int i=INTSIZ-1; i>=0; i--)
        {
            if(tmpIntArray[i]<bi.intArray[i]){tmpIntArray[i]=tmpIntArray[i]+10;tmpIntArray[i-1]=tmpIntArray[i-1]-1;}
            int tmp = tmpIntArray[i] - bi.intArray[i] - borrow;
            borrow = tmp/10;
            bsubtract.intArray[i] = tmp%10;
        }
        return bsubtract;
    }
    public BigInteger multiply(BigInteger bi)
    {   BigInteger bmultiply = new BigInteger();
          for(int i=INTSIZ-1; i>=0; i--)
               bmultiply.intArray[i] =0;
           int k;
       for (int i=INTSIZ-1; i>=1; i--)
        { k=i;
          for (int j=INTSIZ-1; j>=1; j--)
           {int tmp = (intArray[j]) * bi.intArray[i];
               bmultiply.intArray[k] =bmultiply.intArray[k]+tmp;
               bmultiply.intArray[k-1] =bmultiply.intArray[k-1]+ bmultiply.intArray[k]/10;
               bmultiply.intArray[k] %=10;
               k--;
               if(k==0)
                    j=0;
               }
        }
          return bmultiply;
    }

    public void printBigInteger()
    {
        for (int i=0; i<INTSIZ; i++) {
            System.out.print(intArray[i]);
        }
        System.out.println();
    }


    public void inputBigInteger() throws IOException
    {
        BufferedReader input = new BufferedReader
                              (new InputStreamReader(System.in));

        System.out.print("enter the BigInteger: (do not pad with zeros): ");
        String str = input.readLine();

        if (str.length() > INTSIZ) throw new ArithmeticException("OVERFLOW!");

        for (int i=0; i<str.length(); i++)
        {
            intArray[INTSIZ-str.length()+i] =
                    Integer.parseInt(str.substring(i, i+1));
        }
    }
}

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