Write a Socket program in java in which client accept a number, send it to the server, server calculates its factorial and sends result to the client.

By March 20, 2017 
factclient.java

        import java.io.*;
        import java.net.*;
class factclient{
    public static void main(String argv[]) throws Exception
    {
        String n;
        DatagramSocket clientSocket = new DatagramSocket();
        byte []send=new byte[102];
        byte []resive=new byte[102];
        BufferedReader inFromUser = new BufferedReader(new                InputStreamReader(System.in));
        System.out.println("\nEnter Number : ");
        n=inFromUser.readLine();
        InetAddress ipadd= InetAddress.getByName("localhost");
        send=n.getBytes();
        DatagramPacketsendPck=new DatagramPacket(send,send.length,ipadd,6870);
        clientSocket.send(sendPck);
        DatagramPacket resPck=new DatagramPacket(resive,resive.length);
        clientSocket.receive(resPck);
        String fact=new String(resPck.getData());
        System.out.println("FROM SERVER: " +n+"! = " +fact);
        clientSocket.close();
    }
}

       
 factserver.java


        import java.io.*;
        import java.net.*;
class factserver{
    public static void main(String argv[]) throws Exception
    {
        String num,res;
        int i,no;
        long fact;
        System.out.println("Server is ready");
        DatagramSocket serverSocket = new DatagramSocket(6870);
        byte []send=new byte[102];
        byte []resive=new byte[102];
        DatagramPacket resPck=new DatagramPacket(resive,resive.length);
        serverSocket.receive(resPck);
        num=new String(resPck.getData());
        num=num.trim();
        no=Integer.parseInt(num);
        fact=1;
        for(i=1;i<=no;i++)
            fact=fact*i;
        res=Long.toString(fact);
        send=res.getBytes();
        InetAddress ipadd= resPck.getAddress();
        int port=resPck.getPort();
        DatagramPacketsendPck=new DatagramPacket(send,send.length,ipadd,port);
        serverSocket.send(sendPck);
    }
}

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