4. A c.program to create TCP program through which a client send an integer and the server will reverse the number and forward it to the client.

/*A SERVER CODE TO SORT AN ARRAY AND SEND IT TO THE CLIENT*/
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>


int main(){
int sock,len,k,lis,acc,sent;
char line[100],line1[100],line2[100];
int num1,digit=0,rev=0,n;
char buf[]="welcome to socket Programming";
unsigned int rec;
struct sockaddr_in server,client;


sock=socket(AF_INET,SOCK_STREAM,0);

if(sock==-1){
perror("Socket\n");
exit(1);
}
server.sin_family=AF_INET;
server.sin_port=htons(6000);
server.sin_addr.s_addr=INADDR_ANY;

bzero(&server.sin_zero,8);

len=sizeof(struct sockaddr_in);
k=bind(sock,(struct sockaddr *)&server,sizeof(server));
if(k==-1){
perror("bind\n");
exit(1);
}

lis=listen(sock,5);
if(lis==-1){
perror("listen\n");
exit(1);
}

while(1){

printf("waiting for client connection on port 6000\n");
acc=accept(sock,(struct sockaddr *)&client,&len);
if(acc==-1){
perror("accept\n");
exit(1);
}


printf("Passing Information to the client............................\n");

memset(line,0x0,100);

n=recv(acc,line,100,0);
num1=atoi(line);

while(num1!=0){
rev=rev*10;
rev=rev+(num1%10);
num1=num1/10;
}


sprintf(line1,"%d\n",rev);

send(acc,line1,strlen(line1),0);


close(acc);
return 0;

}
}

4.2 CLIENT CODE FOR THE ABOVE SERVER PROGRAM

/*COMPUTER NETWORK OF THE CLIENT PROCESS*/



#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<fcntl.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
int main()
{
  int i,sockfd,n;
  char buf[100];
  char line[100],num2[200],sum[200];
  struct sockaddr_in sa_addr;

  sockfd=socket(AF_INET,SOCK_STREAM,0);


  sa_addr.sin_family=AF_INET;
  sa_addr.sin_addr.s_addr=inet_addr("127.0.0.1"); //Loop back IP address
  sa_addr.sin_port=htons(6000);

  bzero(sa_addr.sin_zero,8);


  i=connect(sockfd,(struct sockaddr *)&sa_addr,sizeof(sa_addr));
printf("connection Established successfully continue your operation\n");

/* After connection, the client can send or receive messages.*/
do{
printf("enter the number to be reversed: ");
scanf("%s",line);
send(sockfd,line,strlen(line)+1,0); 

n=recv(sockfd,line,100,0);
        printf("Reverse number received from server=%s\n",line);
}

while(strcpy(line,"quite"));
	
close(sockfd);

 return 0;
}

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