SIMPLE TCP ECHO CLIENT PROGRAM USING LINUX SOCKET

/*CLIENT PROGRAM OF ECHO SERVER CLIENT*/
/*save this code
  as file name:echo_client.c
COMPILE:-
cc echo_client.c -o echo_client.out
RUN:-
./echo_client.out
OR RUN BY PROVIDING SERVER ADDRESS AND PORT NUMBER
./echo_client.out <server_address>  <portnumber>
example:- 
./echo_client.out 192.168.0.1 1024
NOTE:
SERVER PROGRAM MUST RUN BEFORE CLIENT PROGRAM
 */
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<netinet/in.h>
#include<sys/socket.h>
#define SERV_ADDR "127.0.0.1"
#define PORT_NO 2048
int main(int argc,char *argv[])
{
        int ser_sd;
        int buf_len;
        char buffer[256]={0};
        int port;
        struct sockaddr_in server_info;

        /* CREATION OF A SOCKET FOR CONNECTION TO SERVER*/
        ser_sd=socket(PF_INET,SOCK_STREAM,0);
        if(ser_sd==-1)
        {
                perror("socket():");
                exit(EXIT_FAILURE);
        }
        /*PREPARE SERVER INFORMATION TO sockaddr_in STRUCTURE*/
        /////////////as garbage can make  problems//////////
        bzero(&server_info,sizeof(struct sockaddr_in));
        server_info.sin_family=PF_INET;
        printf("argc=%d\n",argc);
        if(argc==3)
        {
                port=atoi(argv[2]);
                server_info.sin_port=htons(port);
                server_info.sin_addr.s_addr=inet_addr(argv[1]);
        }
        else
        {
                server_info.sin_port=htons(PORT_NO);
                server_info.sin_addr.s_addr=inet_addr(SERV_ADDR);
        }
        /*NOW SERVER STRUCTURE READY FOR USE TO CONNECT SERVER*/
        /*CONNECT FUNCTION FOR CONNECT TO SERVER USING SERVER INFO
          PRESENT IN THE server_info STRUCTURE*/
        if(connect(ser_sd,(struct sockaddr *)&server_info,sizeof(server_info)))
        {
                perror("connect: ");
                exit(EXIT_FAILURE);
        }
        printf("conection sucess\n");
        /*CONNECTION TO SERVER SUCESS NOW WE ARE READY TO PASS MESSAGE*/
        /*IT IS VERY SIMPLE YOU CAN USE SIMPLE READ WRITE FUNCTION
          AS IT IS A REGULAR FILE DESCRIPTOR*/
        while(1)
        {
                bzero(buffer,sizeof(buffer));/*FOR CLEARING THE PREVIOUS CONTENT*/
                scanf(" %[^\n]s",buffer); /*ACCEPTING A MESSAGE FROM KEY BOARD FOR 
                                            SEND*/
                write(ser_sd,buffer,255); /*use for writing to server*/
                if(!(strcmp(buffer,"EXIT")))
                {break;
                }
                buf_len=read(ser_sd,buffer,255);  /*reading echo message from server*/
                buffer[buf_len]='\0';
                printf("%s\n",buffer);
        }
        /*CLOSING OF SERVER SOCKET DESCRIPTOR*/
        if(shutdown(ser_sd,SHUT_RDWR))
        {
                perror("shutdown:");
                exit(EXIT_FAILURE);
        }
        printf("socket is properly closed\n");
}