if (argc != 3) {

cerr<<"Usage: ./client <function> <input>"<<endl;

return 1;

}

/* Building Socket and Establish TCP Connection */

char buffer[BUFFERSIZE];

//create socket package

struct sockaddr_in AWS_address;

AWS_address.sin_family = AF_INET;

AWS_address.sin_port = htons(AWSPORT);

AWS_address.sin_addr.s_addr = atoi(HOST);

//creating Socket

int sockfd = socket(AF_INET, SOCK_STREAM, 0); //socket descriptor

if (sockfd < 0) {

cerr<<"Failed to create client socket"<<endl;

return 1;

}

//socket connection: connect to AWS

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

cerr<<"Failed to Connect to AWS"<<endl;

close(sockfd);

return 1;

}

cout<<"The client is up and running."<<endl;

//send message

string message = string(argv[1]) + " "+string(argv[2]);

int msgLen = send(sockfd, message.c_str(), message.length()+1, 0);

if (msgLen < 0) {

cerr<<"Failed to send Message to server"<<endl;

close(sockfd);

return 1;

}

cout<<"The client sent < "<<argv[2]<<" > and "<<argv[1]<<" to AWS"<<endl;

//receive message from AWS

if ((msgLen = recv(sockfd, buffer, BUFFERSIZE, 0)) < 0) {

cout<<"Error in recving the result"<<endl;

close(sockfd);

return 1;

}

cout<<"According to AWS, "<<argv[1]<<" on < "<<argv[2]<<" >: "<<buffer<<endl;

close(sockfd);

return 0;