client.c

#define closesocket close
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>


#include <stdio.h>
#include <string.h>

#define PROTOPORT 5193
extern int errno;

char localhost[] = "localhost";


int main(int argc, char *argv[])
{
  struct hostent *ptrh;
  struct protoent *ptrp;
  struct sockaddr_in sad;
  int sd;
  int port;
  char *host;
  int n;
  char buf[1000];

  memset((char *)&sad, 0, sizeof(sad));
  sad.sin_family = AF_INET;

  if (argc > 2)
    {
      port = atoi(argv[2]);
    } else port=PROTOPORT;
  if (port > 0)
    {
      sad.sin_port = htons((u_short)port);
    }
  else
    {
      fprintf(stderr, "Invalid port number %s\n",argv[2]);
      return 1;
    }

  if (argc > 1) host=argv[1]; else host=localhost;

  ptrh=gethostbyname(host);
  if ((char *)ptrh==NULL)
    {
      fprintf(stderr, "Invalid host name %s\n",argv[1]);
      return 1;
    }

  memcpy(&sad.sin_addr,ptrh->h_addr,ptrh->h_length);

  if (((long int)(ptrp=getprotobyname("tcp")))==0)
    {
      fprintf(stderr, "Can't change TCP number\n");
      return 1;
    }

  sd = socket(PF_INET, SOCK_STREAM, ptrp->p_proto);

  if (sd < 0)
    {
      fprintf(stderr, "Can't create socket\n");
      return 1;
    }

  if (connect(sd, (struct sockaddr *)&sad, sizeof(sad))<0)
    {
      fprintf(stderr, "Can't connect to socket\n");
      return 1;
    }

  int liczba1;
  printf("Podaj pierwszą liczbę");
  scanf("%d", liczba1);

  int liczba2;
  printf("Podaj drugą liczbę");
  scanf("%d", liczba2);

  char *tekst;
  printf("Podaj operację (+, -, *, /)");
  scanf("%d", tekst);

  send(sd,liczba1,strlen(liczba1),0);
  send(sd,liczba2,strlen(liczba2),0);
  send(sd,operacja,strlen(operacja),0);

  n=recv(sd,buf,sizeof(buf),0);
  while (n>0)
    {
      write(1,buf,n);
      n=recv(sd,buf,sizeof(buf),0);
    }

  closesocket(sd);

  return 0;
}