Question

How to round a floating-point number to an integer in Lua

Answer 1

function round(float)
    return math.floor(float + .5)
end

x = 9382.4;
y = round(x)
print(y)

x = 9382.5;
y = round(x)
print(y)

 
 
--[[
run:
  
9382
9383
  
--]]

 

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Answer 2

function round(float)
    local int, part = math.modf(float)
    if float == math.abs(float) and part >= .5 then return int + 1 -- positive float
    elseif part <= -.5 then return int - 1                         -- negative float
    end
    return int
end

x = 9382.4;
y = round(x)
print(y)

x = 9382.5;
y = round(x)
print(y)

x = -11.4;
y = round(x)
print(y)

x = -11.5;
y = round(x)
print(y)

 
 
--[[
run:
  
9382
9383
-11
-12
  
--]]

 

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