Java BigInt Class: Adding Two Objects with Carryover | Plus Method

[apiwowar]

i changed my test code to what i posted below. it seems that the numbers go in right. num3.digit[47] is 1, num3.digit[48] is 0 and num3.digit[49] is 0 and everything before 47 is 0. but if i just print out num 3 it comes out as 001000...

import java.util.Scanner;

public class BigIntSimpleTestAlt
 {
	public static void main(String[] args)
	{

	Scanner input = new Scanner(System.in);
	
	//int number1 = input.nextInt();
	//int number2 = input.nextInt();
	BigIntAlternate num1 = new BigIntAlternate(99);
		
	BigIntAlternate num2 = new BigIntAlternate(1);
	
	BigIntAlternate num3 = new BigIntAlternate();
	
	num3 = num1.plus(num2);
	for(int i = 0; i <= 49; i++)
	{
	
	
	System.out.println(i + " Num1 + Num2 = " + num3.digit[i]);
	}
	System.out.println("\ncompare num1 and num2 " + num1.compareTo(num2));
	
	}
}

 

[Mark44]

So don't use print or println to display all of the digits. What you did by using a loop to go through each element in the digit array is fine.

Does this work?

System.out.print(num3.digit)

An even better solution would be to write print and println methods for your class to display the digit array.

The code would look like this:

// Display the digits of a BigNum object.
void print(BigNum bn)
{
   for (int i = 0; i < max; i++)
   {
      print(bn.digit[i]);
   }
}

The code for println would be almost identical, except that it would print a newline character after the last digit.

Your last code snippet is much improved, but could use two tweaks - all of the statements in the body of main should be indented, and the body of the for loop should be indented, like the following. I've deleted a few of the lines you aren't using.

public static void main(String[] args)
{
   BigIntAlternate num1 = new BigIntAlternate(99);
   BigIntAlternate num2 = new BigIntAlternate(1);
   BigIntAlternate num3 = new BigIntAlternate();
	
   num3 = num1.plus(num2);
   for(int i = 0; i <= 49; i++)
   {
      System.out.println(i + " Num1 + Num2 = " + num3.digit[i]);
   }
   System.out.println("\ncompare num1 and num2 " + num1.compareTo(num2));
}