Аргументы командной строки

#include "stdafx.h"
#include "stdlib.h"
#include <conio.h>
#include <iostream>
#include <string>
#include <iomanip>
#include <sstream>
#include <stdexcept>
 
int StringToInt(const char * str, bool & err)
{
char * pLastChar = NULL;
int param = strtol(str, &pLastChar, 10);
err = ((*str == '\0') || (*pLastChar != '\0'));
return param;
}
 
int main(int argc, char* argv[])
{
if (argc <= 1)
{
printf("Program calculates sum of its command line arguments.\n");
return 0;
}
int sum = 0;
for (int i = 1; i < argc; ++i)
{
bool err;
int param = StringToInt(argv[i], err);
if (err)
{
printf("Argument #%d is not a number\n.", i);
return 1;
}
printf("%d", param);
sum += param;
if (i != argc-1)
{
printf(" + ");
}
}
printf(" = %d", sum);
system("pause");
}

#include <iostream>
#include <exception>
#include <stdexcept>
#include <cstdlib>
 
#include <boost/program_options.hpp>
 
namespace po = boost::program_options;
 
template <typename T>
auto GetSumArguments(T first, T second) -> decltype (first + second) {
    return first + second;
}
 
int main(int argc, char** argv) {
    int value_first = 0;
    int value_second = 0;
    po::options_description description("allowed options");
    description.add_options()
        ("help,h", "produce help message")
        ("valule_1,1", po::value<int>(&value_first)->default_value(0), "set 'value_1'")
        ("value_2,2", po::value<int>(&value_second)->implicit_value(0), "set 'value_2'");
    po::variables_map options;
    
    try {
        po::store(po::parse_command_line(argc, argv, description), options);
        po::notify(options);
    } catch (const std::exception & exc) {
        std::cerr << exc.what() << std::endl;
        exit(0);
    }
    
    if (options.count("help")) {
        std::cout << description << std::endl;
        exit(0);
    }
    
    std::cout << "Sum of arguments: " << GetSumArguments(value_first, value_second) << std::endl;
}