FLR


flr( a )
flr "floor"
a a number

The flr( a ) function is used to round down the given number, a, and return an integer (whole number).



For example, if we call flr(1.99), the function will round down to the nearest whole number and return that value. Therefore, it will return 1.

value = flr(1.99)
print(value)  --prints 1

If we pass a negative number, for example flr(-5.3), the function will return -6 since it is the nearest whole number down.

value = flr(-5.3)
print(value)  --prints -6

There are many reasons you will want to "floor" a number. One common use is with the time() function, which almost always returns a decimal value, but you may want to simply know the number of seconds passed without any decimal places.

function _draw()
	cls()
	millisec = time()
	sec = flr( millisec )

	print("time="..millisec,20,40,8)
	print("floored="..sec,20,60,12)
end



Shorthand

It is common to want to floor a number after dividing, and there is a shorthand for that, the backslash ( \ ).

--longform
a = flr(10/3)

--shorthand
b = 10\3

It is also common to want to floor a random number.

--longform
a = flr( rnd(10) ) --integer range 0-9

--shorthand
b = rnd(10)\1     --integer range 0-9

Images in this Guide by NerdyTeachers is licensed under CC BY-SA 4.0

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12 May 2023

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