Primary Arithmetic/sun

~cpp 
package primaryarithmetic;

import junit.framework.TestCase;

public class NumberGeneratorTest extends TestCase {

	public void testNoNumber() {
		NumberGenerator ng = new NumberGenerator();
		assertFalse( ng.hasNext() );
	}
	
	public void test123() {
		NumberGenerator ng = new NumberGenerator(123);
		assertEquals( 3, ng.next() );
		assertEquals( 2, ng.next() );
		assertTrue( ng.hasNext() );
		assertEquals( 1, ng.next() );
		assertFalse( ng.hasNext() );
	}
}

~cpp 
package primaryarithmetic;

public class NumberGenerator {

	private int number;
	private byte[] numbers;
	private int numPointer;

	public NumberGenerator() {
		number = -1;
	}

	public NumberGenerator( int number ) {
		if( number < 0 ) throw new ArithmeticException( "0 ������ 그 ��������� ��������� ��������������: " + number );
		this.number = number;
		init();
	}

	private void init() {
		numbers = String.valueOf(number).getBytes();
		numPointer = numbers.length - 1;
	}

	public boolean hasNext() {
		if( number == -1 ) return false;
		return numPointer >= 0;
	}

	public int next() {
		return numbers[numPointer--] - '0';
	}
}

~cpp 
package primaryarithmetic;

import junit.framework.TestCase;

public class PrimaryArithmeticTest extends TestCase {

	public void testCases() {
		int [][] sets = {
				{ 0, 1, 1 },
				{ 1, 5, 5 },
				{ 3, 555, 555 },
				{ 0, 123, 456 },
				{ 1, 123, 594 }
		};
		
		for( int i=0; i<sets.length; i++ ) {
			int expected = sets[i][0];
			int num1 = sets[i][1];
			int num2 = sets[i][2];
			
			verify( expected, num1, num2 );
		}
	}

	private void verify(int expected, int num1, int num2) {
		int result = PrimaryArithmetic.add(num1, num2);
		try {
			assertEquals( expected, result );
		}
		catch( Throwable e ) {
			throw new ArithmeticException( "We expected " + expected + ", but was " + result + " (num1=" + num1 + ", num2=" + num2 + ")" );
		}
	}
}

~cpp 
package primaryarithmetic;

public class PrimaryArithmetic {

	public static int add( int num1, int num2 ) {
		NumberGenerator ng1 = new NumberGenerator( Math.max(num1, num2) );
		NumberGenerator ng2 = new NumberGenerator( Math.min(num1, num2) );
		
		int counts = 0;
		int sumUp = 0;
		
		while( ng1.hasNext() && ng2.hasNext() ) {
			int n1 = ng1.next();
			int n2 = ng2.next();
			int sum = n1 + n2 + sumUp;
			
			if( sum >= 10 ) {
				sumUp = 1;
				counts ++;
			}
			else sumUp = 0;
		}
		
		while( sumUp == 1 && ng1.hasNext() ) {
			int sum = ng1.next() + sumUp;
			if( sum >= 10 ) counts ++;
			else break;
		}
		
		return counts;
	}
}

~cpp 
package primaryarithmetic;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class PrimaryArithmeticApp {
	
	public static void main( String [] args ) throws IOException {
		BufferedReader in = new BufferedReader( new InputStreamReader( System.in ));
		String line;
		
		while( (line=in.readLine()) != null ) {
			String [] numbers = line.split( " " );
			int num1 = Integer.parseInt( numbers[0] );
			int num2 = Integer.parseInt( numbers[1] );
			if( num1 == 0 && num2 == 0 ) break;
			
			int counts = PrimaryArithmetic.add( num1, num2 );
			print( counts );
		}
	}

	private static void print( int counts ) {
		String occurs = (counts == 0) ? "No" : String.valueOf(counts);
		String postfix = (counts > 1) ? "s" : "";
		System.out.println( occurs + " carry operation" + postfix + "." );
	}
}