#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<netdb.h>

 

/*the port number */

 

#define PORT 6100

 

/* the struct used for sending the operands*/

struct {

        int operand1;

        int operand2;

        } operands;

       

/* the structure used for storing the results*/       

struct {

        int sum;

        int mult;

       } results;        

       

 

main( int n, char *v[])

 

{

  int length,recv;

  int sock;

  struct sockaddr_in to;

  struct hostent *hp;

 

  /*testing on the right number of parameters*/

  if( n<3){

  printf("incorrect parameters number");

  exit(1);

  }

  /*getting the address of the server*/ 

  if((hp=gethostbyname(v[1]))==NULL){

   

   perror("host name error");

   exit(2);

   }

   /* allocating the memory for the structure to*/

   bzero((char*)&to,sizeof(to));

  

   /*creation of the socket*/

   sock = socket(AF_INET,SOCK_DGRAM,0);

   if(sock < 0){

   perror("can not create the socket");

    exit(3);

     }

    /*filling the structure to*/

    to.sin_port   = htons(PORT);

    to.sin_family = AF_INET;

    bcopy(hp->h_addr,&to.sin_addr,hp->h_length);

   

    /*casting the operands to integers*/

    operands.operand1 = atoi(v[2]);

    operands.operand2 = atoi(v[3]);

   

    /*sending the structure operands to the server*/

  

    if(sendto(sock,(char*)&operands ,8, 0, (struct sockaddr *)&to,sizeof(to))==-1)

     {

      perror("sendto");

      exit(4);

      }

     

      length = sizeof(to);

     

      /*allocating memory for the structure results and receving the results*/

      bzero((char *)&results,sizeof(results));

      recv = recvfrom(sock,(char*)&results,8,0,(struct sockaddr*)&to,&length);

    

      /*printing the results*/

      printf("***********************************************\n"); 

      printf("the sum is:%d\nthe multiplication is: %d\n",results.sum, results.mult);

      printf("***********************************************\n");

      }