program to find time waited by client to get result

Client program to send a number to server and check whether it is prime or not. client calculates time taken .

#include<arpa/inet.h>

#include<sys/time.h>

//#include "unp.h"

#include<time.h>

#include<stdio.h>

#include<stdlib.h>

main(int argc,char *argv[])

{

        int sock,ret,z,x,n;

        struct sockaddr_in obj;

        struct timeval tv2,tv1;

        static char str[30],str2[30];

        char *ptr,*ptr2;

        char b[50];

        int totalT;

        obj.sin_family=AF_INET;

        obj.sin_port=atoi(argv[1]);

        obj.sin_addr.s_addr=inet_addr("172.16.6.79");//INADDR_ANY;

             sock=socket(AF_INET,SOCK_DGRAM,0);

                printf("eneter the number");

                scanf("%d",&n);

                gettimeofday(&tv1,NULL);

                ret=sendto(sock,&n,sizeof(n),0,(struct sockaddr*)&obj,sizeof(obj));

                int recv_count=0;

                printf("\n the response form sernver is");

                ret=recvfrom(sock,b,sizeof(b),0,(struct sockaddr*)&obj,sizeof(obj));

                recv_count++;

                gettimeofday(&tv2,NULL);

                totalT=(tv2.tv_sec-tv1.tv_sec)+(tv2.tv_usec-tv1.tv_usec);

                printf("\n response %s",b);

                printf("recv_count= %d and time taken=%ld microseconds \n",recv_count,totalT);

                close(sock);

}