Why does for loop using a double fail to terminate

Question

I\'m looking through old exam questions (currently first year of uni.) and I\'m wondering if someone could explain a bit more thoroughly why the following for l

Answer 1

As a general rule, never use double to iterate with due to rounding errors (0.1 may look nice when written in base 10, but try writing it in base 2—which is what double uses). What you should do is use a plain int variable to iterate and calculate the double from it.

for (int i = 0; i < 1000; i++)
  System.out.println(i/10.0);