Исключения

#include <iostream>
#include <string>

using namespace std;

class ArraySizeException
{
    string mess;
public:
    ArraySizeException(const std::string& msg) : mess(msg) {}
    const char* what() const { return mess.c_str(); }
};

class ArrayDataException
{
    string mess;
public:
    ArrayDataException(const std::string& msg) : mess(msg) {}
    const char* what() const { return mess.c_str(); }
};

class ArrayValueCalculator
{
public:
    int doCalculate(const std::string arr[], int size)
    {
        if (size != 16)
        {
            throw ArraySizeException("Found: " + std::to_string(size));
        }

        int sum = 0;

        for (int i = 0; i < size; ++i)
        {
            try
            {
                int value = std::stoi(arr[i]);
                sum += value;
            }
            catch (...)
            {
                throw ArrayDataException("Error (" + std::to_string(i) + "): '" + arr[i] + "'");
            }
        }
        return sum;
    }
};

int main()
{
    string correctArray[16] =
    {
        "145","243","43","04",
        "55","6","3","9",
        "10","16","19","62",
        "3","4","5","6"
    };

    string wrongDataArray[16] =
    {
       "145","243","N","04",
        "55","6","3","9",
        "10","16","19","62",
        "3","4","5","6"
    };

    ArrayValueCalculator cal;

    try
    {
        int result = cal.doCalculate(correctArray, 16);
        cout << "Sum : " << result << endl;
    }
    catch (const ArraySizeException& e)
    {
        cout << "Error : " << e.what() << endl;
    }
    catch (const ArrayDataException& e)
    {
        cout << "Error: " << e.what() << endl;
    }

    try
    {
        int result = cal.doCalculate(wrongDataArray, 16);
        cout << "Sum : " << result << endl;
    }
    catch (const ArraySizeException& e)
    {
        cout << "Error : " << e.what() << endl;
    }
    catch (const ArrayDataException& e)
    {
        cout << "Error: " << e.what() << endl;
    }

    return 0;
}