I thought there is, but I was wrong.

You can scanf("%s %s",str1,str2) p and q
and find out there are at most 2 digits after decimal point

Usually the bug occurs when you change double to integer, epsilon should be added

You're right, there's no error. After AC, I'd like to see this test! :)

P.C. Please, if it's possible, send me one of the kind (konstantingudkov@gmail.com) or just answer me here. Заранее спасибо!