a stringstream example for converting any built-in type or self-defined with _str method

stringstream

#include <sstream> // for stringstream
#include <iostream>

template <class T>
T convert(const char* arg)
{
    T result;
    std::stringstream ss;
    ss << arg;
    ss >> result;

    return result;
}

int test_convert(int argc, const char* argv[])
{
    int p1 = convert<int>(argv[1]);
    double p2 = convert<double>(argv[2]);

    std::cout << "parameter 1 = " << p1 << std::endl;
    std::cout << "parameter 2 = " << p2 << std::endl;

    return 0;
}