basic client server example in c++with sockets

gistfile1.txt

//server.cpp

#include <iostream>
#include <unistd.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#define PORT 8080

int main(int argc, const char * argv[]) {
    // insert code here...
    std::cout << "Server's main() called!\n";
    
    int server_fd;
    int new_socket;
    int valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hi message from server";
    
    //create socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        std::cout << "Socket fd fail " << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "socket fd success. server_fd: " << server_fd << std::endl;
    }
    
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)) == 0) {
        std::cout << "Set socket opt fail" << std::endl;
    } else {
        std::cout << "Set socket opt success" << std::endl;
    }
    
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    if(bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        std::cout << "bind failed" << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "bind success" << std::endl;
    }
    
    if(listen(server_fd, 3) < 0) {
        std::cout << "listen failed" << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "listen success" << std::endl;
    }
    
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        std::cout << "accept fail" << std::endl;
    } else {
        std::cout << "accept success" << std::endl;
    }
    
    valread = read(new_socket, buffer, 1024);
    std::cout << "buffer: " << buffer << std::endl;
    send(new_socket, hello, strlen(hello), 0);
    std::cout << "Hello message sent\n" << std::endl;
    return 0;
}

//client.cpp

#include <stdio.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#include <iostream>
#include <arpa/inet.h>
#include <unistd.h>
#define PORT 8080

int main(int argc, char const *argv[]) {
    struct sockaddr_in address;
    struct sockaddr_in serv_addr;
    int sock = 0;
    int valread = 0;
    char *hello = "Hello from client";
    char buffer[1024] = {0};
    if ((sock = socket(AF_INET, SOCK_STREAM, 0))< 0) {
        std::cout << "socket creation error" << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "socket creation success" << std::endl;
    }
    memset(&serv_addr, '0', sizeof(serv_addr));
    
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    
    //Convert IPv4 and IPv6 addresses from text to binary
    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        std::cout << "Invalid address / address not supported" << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "Valid address " << std::endl;
    }
    
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        std::cout << "Connected failed" << std::endl;
        return EXIT_FAILURE;
    } else {
        std::cout << "Connected successfully" << std::endl;
    }
    
    send(sock, hello, strlen(hello), 0);
    std::cout << "Hello message sent from client" << std::endl;
    valread = read(sock, buffer, 1024);
    std::cout << "" << std::endl;
    std::cout << "buffer: " << buffer << std::endl;
    return 0;
}