oprand aperator result server client

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

//#include <time.h>

#include <pthread.h>

int main(int argc, char *argv[])

{

    int listenfd = 0, connfd = 0, i = 0;

    struct sockaddr_in serv_addr;

               

    listenfd = socket(AF_INET, SOCK_STREAM, 0);

    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    serv_addr.sin_port = htons(atoi(argv[1]));

    if(bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1)

                {

                                printf("bind error\n");

                                close(listenfd);

                                return 1;

                }

    listen(listenfd, 10);

    while(1)

    {

        if((connfd = accept(listenfd,(struct sockaddr *)NULL, NULL))==-1)

                                {

                                                printf("Invalid connection\n");

                                                continue;

                                }

                                printf("accepted connection\n");

    char sendBuff[10],op,op1[4],op2[4];

    //time_t ticks;

int a=0,b=0;

                                //sleep(5);

                read(connfd, sendBuff, sizeof(sendBuff));

                op = sendBuff[0];

                //printf("%c",op);              

                read(connfd, op1, sizeof(op1));

                a = atoi(op1);

                read(connfd, op2, sizeof(op2));

                b = atoi(op2);

                                               

                printf("%d %c %d\n",a,op,b);

        //ticks = time(NULL);

                switch(op)

                {

                                case '+': a = a + b;

                                                break;

                                case '-': a = a - b;

                                                break;

                                case '*': a = a * b;

                                                break;

                                case '/': a = a / b;

                                                break;   

                                case '%': a = a % b;

                }   

                snprintf(sendBuff, sizeof(sendBuff), "%d", a);

        write(connfd, sendBuff, strlen(sendBuff));

        close(connfd);

     }

                close(listenfd);

                return 0;

}

Client Side:

#include <sys/socket.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <netdb.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <arpa/inet.h>

int main(int argc, char *argv[])

{

    int sockfd = 0, n = 0;

    char recvBuff[1024],op,op1[4],op2[4];

    struct sockaddr_in serv_addr;

    if(argc != 3)

    {

        printf("\n Usage: %s <ip of server> <port>\n",argv[0]);

        return 1;

    }

    memset(recvBuff, '0',sizeof(recvBuff));

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

    {

        printf("\n Error : Could not create socket \n");

        return 1;

    }

    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_port = htons(atoi(argv[2]));

    if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0)

    {

        printf("\n inet_pton error occured\n");

        return 1;

    }

    if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)

    {

       printf("\n Error : Connect Failed \n");

       return 1;

    }

            printf("Enter operator : ");

            scanf("%c", &op);

            write(sockfd, &op,1);

            printf("Enter operands : ");

            scanf("%s%s",op1,op2);

            write(sockfd, op1, strlen(op1));

            write(sockfd, op2, strlen(op2));

            printf("Result : ");

    while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)

    {

        recvBuff[n] = 0;

        if(fputs(recvBuff, stdout) == EOF)

        {

            printf("\n Error : Fputs error\n");

        }

            printf("\n");

    }

    if(n < 0)

    {

        printf("\n Read error \n");

    }

    return 0;

}