#include <algorithm>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>

void get_ip_as_str(std::string& ip) {
    do {
        std::cout << "Please input an IP address:" << std::endl;
        std::cin >> ip;
    } while (std::count(ip.begin(), ip.end(), '.') != 3);
}

void split(const std::string& input,const std::string& sep,std::vector<std::string>& output) {
    int l = 0, r, len = input.length();

    for (;;) {
        r = input.find(sep, l);
        if (r == std::string::npos) break;
        output.push_back(input.substr(l, r - l));
        l = r + 1;
    }
    if (l != len) output.push_back(input.substr(l, len - l));
}

void store_ip_as_int(std::string& in_ip, unsigned int& out_ip) {
    std::vector<std::string> ip;
    unsigned char *p = (unsigned char *) (&out_ip);

    split(in_ip, ".", ip);
    while (ip.size() != 0) {
        int i;
        std::istringstream iss(*ip.begin());
        iss >> i;
        *p = i;
        ++p;
        ip.erase(ip.begin());
    }
}

int main(int argc, char *argv[]) {
    std::string in_ip;
    unsigned int out_ip;
    unsigned char *p;
    p = (unsigned char *) &out_ip;

    get_ip_as_str(in_ip);
    store_ip_as_int(in_ip, out_ip);

    std::cout << "IP integer: " << out_ip << std::endl;
    std::cout << "IP address: " << (int) p[0] << "." << (int) p[1] << "." << (int) p[2] << "." << (int) p[3] << std::endl;

    return 0;
}