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Code: Select all

#include <iostream>
#include <string>
#include <sstream>

/* #include <climits> */
#define INT_MAX 2147483647

using namespace std;

template <class T>
string int2string(T number) {
	stringstream stream;
	stream << number;
	return stream.str();
}

int string2int(string number) {
	stringstream stream;
	stream << number;
	int inumber;
	stream >> inumber;
	return inumber;
}

bool bigger(string num, string ref) {
	if (num.length() > ref.length())
		return true;
	if (num.length() < ref.length())
		return false;
	for (int i = 0; i < num.length(); ++i) {
		if (num[i] > ref[i])
			return true;
	}
	return false;
}

void lstrip(string& number) {
	string::size_type pos = number.find_first_not_of("0", 0);
	if (pos > 0)
		number.erase(0, pos);
	if (number == "")
		number = "0";
}    

int main() {
	string max = int2string(INT_MAX);
	string line;
	while (getline(cin, line)) {
		stringstream stream(line);
		string num1, op, num2;
		if (not (stream >> num1 >> op >> num2))
			continue;
		lstrip(num1);
		lstrip(num2);
		bool fail = false;
		cout << line << endl;
		
		if (bigger(num1, max)) {
			cout << "first number too big" << endl;
			fail = not (op[0] == '*' and num2 == "0");
		}
		if (bigger(num2, max)) {
			cout << "second number too big" << endl;
			fail = not (op[0] == '*' and num1 == "0");
		}
		
		if (not fail) {
			if (op[0] == '+') {
				unsigned int result = string2int(num1) + string2int(num2);
				fail = bigger(int2string(result), max);
			} else if (op[0] == '*' and num1 != "0" and num2 != "0") {
				int n1 = string2int(num1);
				int n2 = string2int(num2);
				fail = ((n1 * n2) / n2) != n1;
			}
		}
		
		if (fail) {
			cout << "result too big" << endl;
		}
	}
}

Code: Select all

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

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String line[];
		double a, b;
		try {
			while ((line = in.readLine().split(" ")) != null) {
				a = Double.parseDouble(line[0]);
				b = Double.parseDouble(line[2]);
				System.out.println(line[0] + " " + line[1] + " " + line[2]);
				if (a > (double) Integer.MAX_VALUE) {
					System.out.println("first number too big");
				}
				if (b > (double) Integer.MAX_VALUE) {
					System.out.println("second number too big");
				}
				if (line[1].equals("+")) {
					if ((a + b) > (double) Integer.MAX_VALUE)
						System.out.println("result too big");
				} else if (line[1].equals("*")) {
					if ((a * b) > (double) Integer.MAX_VALUE)
						System.out.println("result too big");
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

Code: Select all

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


public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String line [];
		BigInteger maxInt = new BigInteger(Integer.toString(Integer.MAX_VALUE));
		
		try {
			while((line = in.readLine().split(" ")) != null){
				BigInteger intA = new BigInteger(line[0]);
				BigInteger intB = new BigInteger(line[2]);
				System.out.println(line[0]+" "+line[1]+" "+line[2]);
				if(intA.compareTo(maxInt)==1){
					System.out.println("first number too big");
				}
				if(intB.compareTo(maxInt)==1){
					System.out.println("second number too big");
				}
				if(line[1].equals("+")){
					if((intA.add(intB)).compareTo(maxInt)==1)
						System.out.println("result too big");
				}
				else if(line[1].equals("*")){
					if((intA.multiply(intB)).compareTo(maxInt)==1)
						System.out.println("result too big");
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}