(Java) fixed at some point

Thanks. Corrected :)

the same

In all case it is said that you must return a string in the form : "Buy: b Sell: s", so it is also the case when the given string is empty ! (with b and s convenient).
It is also said that:
"To ease the stockbroker your task is to produce a string of type "Buy: b Sell: s" where b and s are 'double' formatted with no decimal"
So if your result is "181845.99999999997" you have to take the usual rounding, no?

Remove the "static" from the test
This too should be fixed

I didn't get you. What do you exactly mean by "correct output format"?

Yes as said in the examples of the description there are whitespaces before ";". Sometimes brokers don't know very well the rules of punctuation:-)

As said in the description like the other tests:
Test3 and Test6 expect a string in the form
"Buy: b Sell: s" where b and s are 'double' formatted with no decimal, b representing the total price of bought stocks and s the total price of sold stocks so I don't understand why you got "expected: but was:".
The alternative in some tests being:
"Buy: b Sell: s; Badly formed nb: badly-formed 1st simple order ;badly-formed nth simple order ;" when orders are not well formatted.
Maybe you could try anew, codewars seeming sometimes busy and tell me if you can complete the kata.

I fell over the same thing. Given the formula, x should be undefined when a is zero.

Cheers

Cool. Could you mark it as "resolved" for me then, please?

Does that answer your question?

Effectively, 0x^2 + 2x + 3 == 2x + 3. In cases where one or more term = 0, x's value should still be found and returned, though maybe you don't need the quadratic formula for that. /hint hint/