why is 24 * 60 * 60 * 1000 * 1000 divided by 24 * 60 * 60 * 1000 not equal to 1000 in Java?

Question

why is 24 * 60 * 60 * 1000 * 1000 divided by 24 * 60 * 60 * 1000 not equal to 1000 in Java?

Answer 1

If you want to perform that calculation, then you must either re-order the operations (to avoid overflow) or use a larger datatype. The real problem is that arithmetic on fixed-size integers in Java is not associative; it's a pain, but there's the trade-off.