Why am I getting wrong result with multiplication (*) in java

Question

I am new to Java and just want to calculate the number of mili seconds in a year, but the result is not as expected

long milisecondsInYear = 1000*60*60*24*365;
System.out.println(milisecondsInYear); // Expect 31536000000 but get 1471228928

Please advise me on this. Thank you in advance.

this has cross the range of long. – spandey Mar 30 '18 at 05:38 — spandey, Mar 30 '18 at 05:38
You're doing all the math in `int` arithmetic. – user2357112 Mar 30 '18 at 05:38 — user2357112, Mar 30 '18 at 05:38
use `1000L*60*60*24*365` (note L) – Iłya Bursov Mar 30 '18 at 05:39 — Iłya Bursov, Mar 30 '18 at 05:39

Nikos Tzianas · Answer 1 · 2018-03-30T05:46:41.493

Whenever you do any calculations java just assumes and calculates it as an int, even if you're saving the result in a long variable.

The actual result can't fit in the intvariable, hence you get that value.

To solve the problem you need to add an L at the end to let java know this is actually a long.

long milisecondsInYear = 1000*60*60*24*365L;
System.out.println(milisecondsInYear); // Expect 31536000000 but get 1471228928

1 Answers1