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THIS PROGRAM FOR SINGLE SERVER-MULTI CLIENT IN SAME NETWORK.IF YOU WANT TO MAKE THIS CODE FOR DIFFERENT SYSTEM THEN YOU NEED TO CHANGE IP ADDRESS OF ACCORDING TO SERVER'S IP ADDRESS 

SERVER PROGRAM

#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>

int main()
{
int sockfd,confd,n,clilen;
char buff[256];

struct sockaddr_in server, client;

sockfd =socket(AF_INET,SOCK_STREAM,0);
printf("Socket OK.\n");

server.sin_family = AF_INET;
server.sin_port = htons(9000);
server.sin_addr.s_addr = inet_addr("127.0.0.1");
bind(sockfd,(struct sockaddr*)&server,sizeof(server));
printf("Bind OK.\n");

listen(sockfd,4);
printf("Listening OK.\n\n");
   
    clilen=sizeof(client);
//confd=accept(sockfd,(struct sockaddr*)&client,&clilen);
//printf("Accept OK.\n");
   
while(1)
{
confd=accept(sockfd,(struct sockaddr*)&client,&clilen);
printf("Accept OK.\n");

printf("Waiting for Client's Message.\n");
bzero(buff,256);
n = read(confd,buff,256);
if(buff[0]=='q')
{
close(confd);
break;
}
printf("CLIENT : %s",buff);
n = write(confd,"Message Received.",17);
}
close(sockfd);
}

CLIENT PROGRAM

/********************************************************************************/
/* Title :: Client Socket Programm */
/* */
/* This is CLIENT program */
/* */
/* Auther : Kaneria Dhaval */
/* */
/* Usage : ~$ gcc -w -o client client.c */
/* ./client */
/* */
/********************************************************************************/

include<sys/socket.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<stdlib.h>

#include<stdio.h>

#include<string.h>

int main(){

int sockfd,confd,n,len;

char  buff[256];

struct sockaddr_in server,client;

len = sizeof(struct sockaddr_in);

sockfd = socket(AF_INET, SOCK_STREAM, 0);

printf("Socket OK.\n");

server.sin_family = AF_INET;

server.sin_port = htons(9000);

server.sin_addr.s_addr = inet_addr("127.0.0.1");

confd=connect(sockfd,(struct sockaddr*)&server,sizeof(server));

printf("Connection OK.\n");

while(1)

{

printf("\nMessage : ");

fgets(buff,256,stdin);

n=write(sockfd,buff,strlen(buff));

printf("> Message Sent.\n");

if(buff[0]=='q')

{

close(confd);

break;

}

n=read(sockfd,buff,17);

printf("Server : %s",buff);

}

close(sockfd);

return 0;

}