Friday, October 19, 2012

Problem Links:




Write a program that reads an expression consisting of two non-negative integer and an operator. Determine if either integer or the result of the expression is too large to be represented as a ``normal'' signed integer (type integer if you are working Pascal, type int if you are working in C).


An unspecified number of lines. Each line will contain an integer, one of the two operators + or *, and another integer.


For each line of input, print the input followed by 0-3 lines containing as many of these three messages as are appropriate: ``first number too big'', ``second number too big'', ``result too big''.

Sample Input

300 + 3
9999999999999999999999 + 11

Sample Output

300 + 3
9999999999999999999999 + 11
first number too big
result too big

Source Code:

import java.math.BigInteger;

public class Main {
 public static void main(String[] args) throws IOException {
  BufferedReader br = new BufferedReader(new InputStreamReader(;
  String line;
  while ((line = br.readLine()) != null) {
   String text[] = line.split(" ");
   BigInteger a = new BigInteger(text[0]);
   BigInteger b = new BigInteger(text[2]);
   BigInteger sum;
   if (text[1].equals("+"))
    sum = a.add(b);
    sum = a.multiply(b);
   // BigInteger Max = new BigInteger("2147483647");
   BigInteger Max = new BigInteger(Integer.toString(Integer.MAX_VALUE));
   if (a.compareTo(Max) > 0)
    System.out.println("first number too big");
   if (b.compareTo(Max) > 0)
    System.out.println("second number too big");
   if (sum.compareTo(Max) > 0)
    System.out.println("result too big");