converting Hex string to unsigned long

hex_string_to_ulong.cc

#include <sstream>
#include <iostream>

int main()
{

    std::string s("0xFFF000");
    unsigned long value;
    std::istringstream iss(s);
    iss >> std::hex >> value;
    std::cout << value << std::endl;

    return 0;
}