Get IP ifconfig code

#include <arpa/inet.h>
#include <ifaddrs.h>
#include <string.h>

#include <string> //c++
#include <iostream>

using namespace std;
int main ()
{
    struct ifaddrs *ifap, *ifa;
    std::string addr,mask;

    getifaddrs (&ifap);
    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
        if (ifa->ifa_addr->sa_family==AF_INET && strcmp (ifa->ifa_name ,"lo")!=0) {
            addr = inet_ntoa( ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr);
            mask = inet_ntoa( ((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr);
           cout <<"Interface :"<<ifa->ifa_name<<" : " <<addr<<endl;
           cout <<"mask  :"<<mask<<" : " <<endl;
            //freeifaddrs(ifap);
        }
    }
    freeifaddrs(ifap);
    return 0;
}