IMPA/p465/p465.cpp

#include <algorithm>
#include <array>
#include <iostream>
#include <map>
#include <utility>
#include <vector>
#include <iomanip>
#include <sstream>
#include <climits>

using namespace std;

int main()
{
    double left, right, result;
    string left_s, right_s;

    char operation;
    while(cin >> left_s >> operation >> right_s)
    {
        cout << left_s << " " << operation << " " << right_s << endl;
        stringstream ss;
        ss << left_s << " " << right_s;
        ss >> left >> right;

        if(left > INT_MAX)
        {
            cout << "first number too big" << endl;
        }
        if(right > INT_MAX)
        {
            cout << "second number too big" << endl;
        }

        if(operation == '+')
            result = left + right;
        else
            result = left * right;

        if(result > INT_MAX)
        {
            cout << "result too big" << endl;
        }
    }

    return 0;
}