Client2

#define WIN32_LEAN_AND_MEAN
#include <iostream>
#include <string>
#include <windows.h>
#include <ws2tcpip.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"

int main() {

    cout << "Client starting...\n";

    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    addrinfo hints{};
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    addrinfo* result = nullptr;
    getaddrinfo("localhost", DEFAULT_PORT, &hints, &result);

    SOCKET connectSocket = socket(result->ai_family,result->ai_socktype,result->ai_protocol);

    connect(connectSocket,result->ai_addr,(int)result->ai_addrlen);

    freeaddrinfo(result);

    cout << "Connected to server!\n";

    while (true) {

        string message;

        cout << "\nEnter message (type exit to quit): ";
        getline(cin, message);

        send( connectSocket,message.c_str(),message.size(),0);

        if (message == "exit")
            break;

        char buffer[DEFAULT_BUFLEN];

        int iResult = recv(connectSocket, buffer, DEFAULT_BUFLEN - 1,0);

        if (iResult > 0) {

            buffer[iResult] = '\0';

            cout << "Server reversed: "<< buffer << endl;
        }
        else {
            break;
        }
    }

    shutdown(connectSocket, SD_SEND);
    closesocket(connectSocket);
    WSACleanup();

    cout << "Client stopped.\n";

    return 0;
}

Server2

#include <iostream>
#include <string>
#include <algorithm>
#include <ws2tcpip.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")

int main()
{
    setlocale(0, "");
    system("title SERVER SIDE");

    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    addrinfo hints{};
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;
    hints.ai_flags = AI_PASSIVE;

    addrinfo* result = NULL;
    getaddrinfo(NULL, "27015", &hints, &result);

    SOCKET ListenSocket = socket(result->ai_family,result->ai_socktype,result->ai_protocol);

    bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);
    freeaddrinfo(result);

    listen(ListenSocket, SOMAXCONN);

    cout << "Waiting for client...\n";

    SOCKET ClientSocket = accept(ListenSocket, NULL, NULL);

    cout << "Client connected!\n";

    closesocket(ListenSocket);

    while (true)
    {
        char message[512]{};

        int bytes = recv(ClientSocket, message, 512, 0);

        if (bytes > 0)
        {
            message[bytes] = '\0';
            string text = message;
            cout << "Client message: " << text << endl;

            if (text == "exit")
                break;

            reverse(text.begin(), text.end());

            send(ClientSocket, text.c_str(), text.size(), 0);
        }
        else if (bytes == 0)
        {
            cout << "Connection closing...\n";
            break;
        }
        else
        {
            cout << "recv error\n";
            break;
        }
    }

    shutdown(ClientSocket, SD_SEND);
    closesocket(ClientSocket);
    WSACleanup();

    cout << "Server stopped.\n";

    return 0;
}