b115: TOI2008 2. 大數運算 FYI: https://yunlinsong.blogspot.com/2015/10/toi2008-2.html

b115.cpp

import java.util.Scanner;
import java.math.BigInteger;

public class JAVA {
	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		String op;
		BigInteger a, b, c = null;
		while (cin.hasNext()) {
			a = cin.nextBigInteger();
			op = cin.next();
			b = cin.nextBigInteger();
			
			if(op.equals("+") == true)
			{
				c = a.add(b);
			}
			else if(op.equals("-") == true)
			{
				c = a.subtract(b);
			}
			else if(op.equals("*") == true)
			{
				c = a.multiply(b);
			}
			else if(op.equals("/") == true)
			{
				c = a.divide(b);
			}
			
			System.out.println(c.toString());
		}
	}
}