Rounding Decimals

soulphalanx · Post by **soulphalanx** » Tue Aug 23, 2005 4:18 am

Can anyone tell me how to round down or round up a decimal number?

Benihana · Post by **Benihana** » Tue Aug 23, 2005 4:29 am

Programming in Lua
rounding functions (floor, ceil)

Wikipedia entry for floor and ceil
floor: for a real number x, floor(x) is the largest integer less than or equal to x.
ceil: for a real number x, ceiling(x) is the smallest integer no less than x.

soulphalanx · Post by **soulphalanx** » Tue Aug 23, 2005 4:50 am

luaplayer doesnt recognize floor(X) and ceiling(X)

Benihana · Post by **Benihana** » Tue Aug 23, 2005 4:59 am

That's because you didn't follow the link and look at the way it was used... it is part of the math library, therefore implentation is as follows:

local x = math.ceil(2.3)
print(x) --> 3

Nils · Post by **Nils** » Thu Aug 25, 2005 3:42 am

try that.

Code: Select all

function math.round&#40;num, idp&#41;
  local mult = 10^&#40;idp or 0&#41;
  return math.floor&#40;num  * mult + 0.5&#41; / mult
end

x = 8.13
math.round(x) = 8
y = 8.52
math.round(y) = 9