#include <iostream>                 //    ____                _                  _        _      __                  __  
#include <sys/socket.h>             //   |  _ \ ___  __ _  __| |  ___  ___   ___| | _____| |_   / / __ ___  _____   _\ \. 
#include <netinet/in.h>             //   | |_) / _ \/ _` |/ _` | / __|/ _ \ / __| |/ / _ \ __| | | '__/ _ \/ __\ \ / /| |
#include <arpa/inet.h>              //   |  _ <  __/ (_| | (_| | \__ \ (_) | (__|   <  __/ |_  | | | |  __/ (__ \ V / | |
#include <unistd.h>                 //   |_| \_\___|\__,_|\__,_| |___/\___/ \___|_|\_\___|\__| | |_|  \___|\___| \_/  | |
                                    //                                                          \_\                  /_/ 
int main(int argc, char **argv) {
 
	int fd = socket(PF_INET, SOCK_STREAM, 0);
 
	sockaddr_in address { .sin_family = AF_INET,
	                      .sin_port = htons(13),
	                      .sin_addr = {.s_addr = inet_addr("127.0.0.1") }
	                    };
 
	connect(fd, (sockaddr*) &address, sizeof(address));
 
	char buffer[255];
 
	ssize_t readSize = recv(fd, buffer, 254, 0);
 
	buffer[readSize] = 0;
 
	close(fd);
 
	std::cout << buffer << std::endl;
 
	return 0;
}

#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include <netdb.h>
 
int main(int argc, char ** argv){
	if(argc!=3) error(1,0,"Need 2 args");
 
	addrinfo *ao;
	int res = getaddrinfo(argv[1],argv[2],nullptr, &ao);
	if(res || !ao) error(1,errno, "getaddrinfo");
 
	int sock = socket(ao->ai_family, SOCK_STREAM, 0);
	if(sock<0) error(1,errno, "socket");
 
	res = connect(sock, ao->ai_addr, ao->ai_addrlen);
	if(res) error(1,errno, "connect");
	freeaddrinfo(ao);
 
// ...
 
	return 0;
}