BigInteger313.java

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

 


public class BigInteger

{

    public static final String QUIT_COMMAND = "quit";

    public static final String MSG_INVALID_INPUT = "입력이 잘못되었습니다.";
    

 

    // implement this

    public static final Pattern EXPRESSION_PATTERN = Pattern.compile("^\\s*[-+]?[0-9]+\\s*[+*-]\\s*[-+]?[0-9]+\\s*$");



    public BigInteger(int i)

    {
    	

    }

 

    public BigInteger(int[] num1)

    {
    	
    		

    }

 

    public BigInteger(String s)

    {
    	

    }

 

    public BigInteger add(BigInteger big)

    {

    }

 

    public BigInteger subtract(BigInteger big)

    {
    	

    }

 

    public BigInteger multiply(BigInteger big)

    {

    }

 

    //@Override

    public String toString()

    {

    }

 

    static BigInteger evaluate(String input) throws IllegalArgumentException

    {

        Matcher m = EXPRESSION_PATTERN.matcher(input);
        if(!m.find())
        	throw new IllegalArgumentException();
        

        // parse input

        // using regex is allowed

 

        // One possible implementation

        // BigInteger num1 = new BigInteger(arg1);

        // BigInteger num2 = new BigInteger(arg2);

        // BigInteger result = num1.add(num2);

        // return result;

    }

 

    public static void main(String[] args) throws Exception

    {

        try (InputStreamReader isr = new InputStreamReader(System.in))

        {

            try (BufferedReader reader = new BufferedReader(isr))

            {

                boolean done = false;

                while (!done)

                {

                    String input = reader.readLine();

 

                    try

                    {

                        done = processInput(input);

                    }

                    catch (IllegalArgumentException e)

                    {

                        System.err.println(MSG_INVALID_INPUT);

                    }

                }

            }

        }

    }

 

    static boolean processInput(String input) throws IllegalArgumentException

    {

        boolean quit = isQuitCmd(input);

 

        if (quit)

        {

            return true;

        }

        else

        {

            BigInteger result = evaluate(input);

            System.out.println(result.toString());

 

            return false;

        }

    }

 

    static boolean isQuitCmd(String input)

    {

        return input.equalsIgnoreCase(QUIT_COMMAND);

    }

}