[C++] c udp server client demo

//
// Created by gxf on 2020/2/7.
//
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#define BUFFSIZE 1024
int main(){
  int serverSocketFd = socket(AF_INET, SOCK_DGRAM, 0);
  struct sockaddr_in serverAddr;
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(1234);
  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
  int ret = bind(serverSocketFd, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
  if (ret) {
    fprintf(stderr, "bind fail");
    exit(1);
  }
  struct sockaddr_in cliAddr;
  socklen_t cliAddrLen = sizeof(cliAddr);
  while (1) {
    char buff[BUFFSIZE];
    int readCount = recvfrom(serverSocketFd, buff, BUFFSIZE, 0, (struct sockaddr*)&cliAddr, &cliAddrLen);
    buff[readCount] = '\0';
    printf("Receive from client:%s\n", buff);
    sendto(serverSocketFd, buff, BUFFSIZE, 0, (struct sockaddr *)&cliAddr, cliAddrLen);
  }

  return 0;
}

//
// Created by gxf on 2020/2/7.
//
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define BUFSIZE 1024
int main(){
  int clientSocketFd = socket(AF_INET, SOCK_DGRAM, 0);
  struct sockaddr_in serverAddr;
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(1234);
  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
  socklen_t addrLen = sizeof(serverAddr);
  while (1) {
    char buff[BUFSIZE];
    printf("Enter msg send to server:");
    scanf("%s", buff);
    sendto(clientSocketFd, buff, BUFSIZE, 0, (struct sockaddr*)&serverAddr, addrLen);
    int readCount = recvfrom(clientSocketFd, buff, BUFSIZE, 0, (struct sockaddr*)&serverAddr, &addrLen);
    buff[readCount] = '\0';
    printf("Receive from server:%s\n", buff);
  }
  return 0;
}