Currency Rounding Up

croo

EyeSight wrote: »

out of sheer curiosity, would €50.009 = €50 also?
in money related software is it the standard to always round down no matter how high the offset is??

Not to fork the OP's thread... but there are many rounding methods. The most common being round half up ... which most people are familiar with and would round your €50.009 to €50.01. But one method I came across is called "bankers' rounding" or "round half to even" where, as its name implies, it only rounds up (after half) to an even number. When I happened across the bankers' rounding I thought it must be an error but wikipedia has a good article on the subject that enlightened me http://en.wikipedia.org/wiki/Rounding

irishguy

I used to work for a large bank they used either 6 or 8 digits after the decimal place. If you apply it consistently to all transactions (ensure your OS and Database support this) then you will have Zero balancing problems.

onemorechance

I found a list of rounding algorithms here: Rounding Algorithms 101

# Round-Ceiling (Positive Infinity)
# Round-Away From-Zero

These are what my case needed.

mark renton

^^

looks to me it may have come from your text book

yawha

Giblet wrote: »

That won't work, you truncate x and add .01, so you'll always have x.01 as the number if there is a remainder in the 100's or less.

x +- .01f;
x = ((int)x * 100) / 100.0f

This will truncate after two decimal places correctly

God dammit. Brain was not functioning. You're correct.

onemorechance

john47832 wrote: »

^^

looks to me it may have come from your text book