Let's try a wild guess, you are using a little-endian machine such as a x86?

unsigned short my_port=atoi(argv[2]);

memset(&sad,0,sizeof(sad));
sad.sin_family=AF_INET;
sad.sin_port=htons(my_port);
sad.sin_addr.s_addr=inet_addr(argv[1]);

as long as both port and host are numeric, else use getservbyname and gethostbyname.