util.math.modf

local integer, fraction = util.math.modf(
    value
)

Type	Name	Description
`float`	value	Number to split into integer and fractional parts

Type	Name	Description
`int`	integer	Integer part of value
`float`	fraction	Fractional part of value (same sign as value)

Split a positive float

local integer, fraction = util.math.modf(4.75)

core.engine.print("info", integer, fraction) -- 4  0.75

Split a negative float

local integer, fraction = util.math.modf(-3.25)

core.engine.print("info", integer, fraction) -- -3  -0.25

Split an exact integer

local integer, fraction = util.math.modf(10.0)

core.engine.print("info", integer, fraction) -- 10  0.0

Get only the integer part

local integer = util.math.modf(9.99)

core.engine.print("info", integer) -- 9

Get only the fractional part

local _, fraction = util.math.modf(9.99)

core.engine.print("info", fraction) -- 0.99

Separate seconds and milliseconds

local elapsed = 3.456
local secs, ms = util.math.modf(elapsed)

core.engine.print("info", secs, util.math.floor(ms*1000)) -- 3  456

Check if a number is a whole integer

local n = 5.0
local _, fraction = util.math.modf(n)

if fraction == 0 then
    core.engine.print("info", "Whole number")
end