Dividing Doubles in swift by 100

Asked May 16 '16 at 20:27

Active May 16 '16 at 20:29

Viewed 40 times

var a:Double = 7599
var b:Double = 7598

var x = a / 100 (75.98999999999999)
var y = b / 100 (75.98)

Can anyone tell me why y is calculating to 2 decimal places and more importantly why x isn't?

I basically use this function in a RoundUp and RoundDown function but it doesn't work for certain numbers.

edited May 16 '16 at 20:29

rmaddy

asked May 16 '16 at 20:27

LateNate

1

Because a and b are different. – sebenalern May 16 '16 at 20:29
2

Spend some quality time reading http://stackoverflow.com/questions/588004/is-floating-point-math-broken – rmaddy May 16 '16 at 20:31
This is due to the nature of [floating point arithmetic](https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html). (Even heavier reading) – Hamish May 16 '16 at 20:31

0 Answers0