7 replies to this topic

[Sewbacca]

For example:

int, rest = restDivision(50, 8)
-- int --> 6
-- rest -- > 0.25

Edited by Sewbacca, 04 April 2016 - 06:14 PM.

[SquidDev]

local function intDiv(a, B)/>
  local div = a / b
  local round = div < 0 and math.ceil(div) or math.floor(div)
  return round, div - round
end

intDiv(50, 8) -- 6, 0.25
intDiv(-50, 8) -- -6, -0.25 -- You can always do math.abs on the rest to get the positive version

The div < 0 and math.ceil(div) or math.floor(div) gets the integer part always rounded towards 0 (as Lua as no function to do this).

Edited by SquidDev, 04 April 2016 - 05:50 PM.

[Sewbacca]

thanks

[Dragon53535]

Modulus works just as well.

local function restDivision(numerator,divisor)
  --#Grab just the pure division, since that's going to be int plus rest
  local int = numerator/divisor

  --#Grab our decimal, this is your rest
  local decimal = int % 1

  --#Remove the decimal from int
  int = int - decimal

  --#return
  return int,decimal
end
 

[Bomb Bloke]

You'd think so, but that code fails for negative numerators.

[Dragon53535]

True. I'm assuming you're meaning that the -decimal part would subtract on a negative and not work correctly?

local function restDivision(numerator,divisor)
  --#Grab just the pure division, since that's going to be int plus rest
  local int = numerator/divisor
  --#Grab our decimal, this is your rest
  local decimal = int % 1
  --#Remove the decimal from int
  --#the and or parts is lua ternary.
  --#Basically if int > 0 then int = int - decimal
  --#else int = int + decimal
  int = int > 0  and int - decimal or int + decimal
  --#return
  return int,decimal
end

[Bomb Bloke]

Give it a test and see.

print(restDivision(-50, 8)) --> ???

[Dragon53535]

*sigh* but then I have to load up minecraft again.

Why, oh why, would this do THAT.

Thanks for the test case BB, that's an annoying as hell way to do that.

Edit: For those wondering ( -6.25 % 1 == 0.75)

local function restDivision(numerator,divisor)
  --#Grab just the pure division, since that's going to be int plus rest
  local int = numerator/divisor
  --#Grab our decimal, this is your rest
  --#Woo, doing the ternary HERE
  local decimal = int % (int > 0 and 1 or -1)
  int = int - decimal
  --#return
  return int,decimal
end

Edited by Dragon53535, 05 April 2016 - 02:30 AM.