server8.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>


struct student{
	int roll;
	int m1;
	int m2;
	int m3;
	double avg;
};

void main(){
  int ssock,csock;
  struct sockaddr_in server,client;

	struct student a[12];
	int i,n;

  unsigned int len=sizeof(struct sockaddr_in);

  if((ssock=socket(AF_INET,SOCK_STREAM,0))==-1){
    perror("Cannot create server\n");
    exit(-1);
  }

  server.sin_family=AF_INET;
  server.sin_addr.s_addr=INADDR_ANY;
  server.sin_port=htons(10000);
  bzero(&server.sin_zero,0);

  if(bind(ssock,(struct sockaddr*)&server,len)==-1){
    perror("Cannot bind\n");
    exit(-1);
  }

  if(listen(ssock,5)==-1){
    perror("Cannot listen\n");
    exit(-1);
  }

  if((csock=accept(ssock,(struct sockaddr*)&client,&len))==-1){
    perror("Cannot accept\n");
    exit(-1);
  }



  for(i=1;i<=11;i++){
  	a[i].roll=i;
		a[i].m1=(i*i+5)%10;
		a[i].m2=(i*i+6)%10;
		a[i].m3=(i*i+4)%10;
		a[i].avg=(a[i].m1+a[i].m2+a[i].m3)/3.0;
  }
	recv(csock,&n,sizeof(n),0);
	send(csock,&a[n],sizeof(a[n]),0);

  close(ssock);

}