IP-Adresse einlesen und als Hex ausgeben

einleser.cpp

#include <iostream>
#include <stdlib.h>

int main()
{
        std::string a_ip;

        std::cin >> a_ip;

        int icomponents[4];

        int prepos = 0;
        int curpos = a_ip.find('.', prepos);

        std::string tmp;

        tmp = a_ip.substr(prepos, curpos - prepos);
        icomponents[0] = atoi(tmp.c_str());
        prepos = curpos + 1;

        curpos = a_ip.find('.', prepos);

        tmp = a_ip.substr(prepos, curpos - prepos);
        icomponents[1] = atoi(tmp.c_str());
        prepos = curpos + 1;

        curpos = a_ip.find('.', prepos);
        tmp = a_ip.substr(prepos, curpos - prepos);
        icomponents[2] = atoi(tmp.c_str());
        prepos = curpos + 1;

        tmp = a_ip.substr(prepos);
        icomponents[3] = atoi(tmp.c_str());


        std::cout << std::hex;
        for (int i=0; i < 4; i++)
        {   
                std::cout << icomponents[i];
                if (i != 3)
                        std::cout << '.';
        }   
        std::cout << std::endl;
}