Reverse a number using TCP IP Protocol

Question: send an integer from client to server and Reverse that number in Server after that Send result to client

TCPIP Client number reverse Program

#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret,i,j,num,res;
socklen_t len;
char buf[20],ch;
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_STREAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[2]));
sAddr.sin_addr.s_addr=inet_addr(argv[1]);
if(connect(sd,(struct sockaddr *)&sAddr,sizeof(sAddr))==-1)
{
perror("connect");
return;
}
printf("connect successful\n");
printf("enter msg to send...\n");
scanf("%d",&num);
send(sd,&num,4,0);
recv(sd,&res,4,0);
printf("number after reverse is:%d\n",res);
close(sd);
}

TCPIP Server Number reverse Program

#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret,i,j,rev=0,res=0,num=0;
socklen_t len;
char buf[20],ch;
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_STREAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[1]));
sAddr.sin_addr.s_addr=inet_addr("0.0.0.0");
if(bind(sd,(struct sockaddr *)&sAddr,sizeof(sAddr))==-1)
{
perror("bind");
return;
}
printf("bind successful....\n");
listen(sd,5);
len=sizeof(sAddr);
printf("waiting for client request...\n");
newsd=accept(sd,(struct sockaddr *)&cAddr,&len);
if(newsd==-1)
{
perror("accept");
return;
}
printf("connection accepted\n");
printf("waiting for data...\n");
//bzero(num,20);
recv(newsd,&num,4,0);
printf("num:%d\n",num);
while(num>0)
{
//rev=rev*10;
rev=(rev*10)+(num%10);
num=(num/10);
}
printf("reversed num is %d\n",rev);
ret=send(newsd,&rev,4,0);
if(ret==-1)
perror("send");
else
printf("send successful...\n");
close(sd);
close(newsd);
}

Categories: Network Programming, TCPIP