#!/usr/bin/env python3
from socket import *
from struct import pack, unpack

# Create a socket.  This doesn't open a port or anything yet
# Parameters:
#   AF_INET is ipv4, AF_INET6
#   SOCK_STREAM means TCP, SOCK_DGRAM would be UDP
our_socket = socket(AF_INET, SOCK_STREAM)
our_socket.connect(("isoptera.lcsc.edu", 5111))    

while True:
    problem = input("Enter an addition problem like 4 + 5:  ")
    a, op, b = problem.split()
    if(op != '+'):
        print("Sorry, unsupported operand, goodbye!")
        break
    
    data_to_send = pack("!ii", int(a), int(b))
    our_socket.send(data_to_send)
    
    packed_result = our_socket.recv(4)
    result = unpack("!i", packed_result)
    # To unpack the tuple unpack gave us
    print("The answer was:  ", result[0])
    
our_socket.close()