Java Easy Subtraction

Asked Nov 03 '16 at 22:34

Active Nov 03 '16 at 22:34

Viewed 28 times

I've been having some trouble with a little math i've been doing in Java. Long story short, when I do:

double totalS = 1146.35;
double down = 114.63;

result = totalS - down;

And the result for this comes out as 1031.7199999999998, when doing this easy equation on a calculator produces 1031.72. Any idea?

asked Nov 03 '16 at 22:34

Frost

Also see: https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html – azurefrog Nov 03 '16 at 22:35
You can't program without knowing something about how floating point numbers work. – duffymo Nov 03 '16 at 22:37
Well that's how primitive floating points work. You may try [BigDecimal](https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html) – Nov 03 '16 at 22:39
You can round to two decimal places using Math.round – Ashley Frieze Nov 03 '16 at 23:17

0 Answers0