Linux & C :- Socket Application, server will perform arithmetic operations

Code for Client

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>

int main(int argc,int *argv[])
{
int n1=atoi(argv[1]),n2=atoi(argv[2]),res=0;

char operator=argv[3][0];
int sock_id=socket(AF_UNIX,SOCK_STREAM,0);
if(sock_id<0)
{
printf("Error in getting socket\n");
return 0;
}

struct sockaddr_in clientstruct;
clientstruct.sin_family=AF_UNIX;
clientstruct.sin_addr.s_addr=inet_addr("127.0.0.1");
clientstruct.sin_port=1025;

int ret=connect(sock_id,(struct sockaddr *)&clientstruct,sizeof(clientstruct));


write(sock_id,&n1,sizeof(n1));
write(sock_id,&n2,sizeof(n2));
write(sock_id,&operator,sizeof(operator));

int ret1=read(sock_id,&res,sizeof(res));
printf("FROM SERVER:%d \n Bytes=%d\n",res,ret1);
close(sock_id);



return 0;
}

Code for Server

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

int main()

{

int n1,n2,res=0;

char operator;

int session_id;

int server_id=socket(AF_UNIX,SOCK_STREAM,0);

if(server_id<0)

{

printf("Error in getting socket\n");

return 0;

}

struct sockaddr_in serverstruct,clientstruct;

serverstruct.sin_family=AF_UNIX;

serverstruct.sin_addr.s_addr=inet_addr("127.0.0.1");

serverstruct.sin_port=1025;

int i=bind(server_id,(struct sockaddr*)&serverstruct,sizeof(serverstruct));

if(i<0)

{

printf("Error in bind\n");

return 0;

}

i=listen(server_id,10);

if(i<0)

{

printf("Error in listening\n");

return 0;

}

int client_len=sizeof(serverstruct);

while(1)

{

printf("Waiting for the client\n");

session_id=accept(server_id,(struct sockaddr*)&serverstruct,&client_len);

read(session_id,&n1,sizeof(n1));

read(session_id,&n2,sizeof(n2));

read(session_id,&operator,sizeof(operator));

switch(operator)

{

case '+':

res=n1+n2;

break;

case '-':

res=n1-n2;

break;

case '*':

res=n1*n2;

break;

case '/':

res=n1/n2;

break;

default:

printf("invalid operation\n");

}

printf("From CLIENT:n1=%d\n",n1);

printf("From CLIENT:n2=%d\n",n2);

printf("From CLIENT:operator=%c\n",operator);

int b=write(session_id,&res,sizeof(res));

close(session_id);

}

close(server_id);

return 0;

}