#!/usr/bin/env python
# (c) 2018 Georgios Gousios <gousiosg@gmail.com>
#
# Barebones linear equation solving trainer

from __future__ import division
from random import randint
import codecs
import sys

UTF8Writer = codecs.getwriter('utf8')
sys.stdout = UTF8Writer(sys.stdout)

tries = 1
success = 0
errors = 0

while True:
    a = randint(1, 5)
    x = randint(1, 5)
    b = randint(1, 8)

    y = a * x + b

    r = 0
    while r != x:
        try:
            r = int(input("%dX + %d = %d. X = " % (a, b, y)))
            tries += 1
            if r == x:
                success += 1
                print(u'\U0001F600')
            else:
                errors += 1
                print(u'\u2639')
        except KeyboardInterrupt:
            print()
            print(u'\U0001F44D success rate: %f %%' % (success/tries * 100))
            exit(0)
        except SyntaxError:
            print("Please input a number")