How to find when a variable is a decimal?
So I am making a script that tells me what number is a prime number.
local dividend= 1
local divisor= 1
function divide()
local result= dividend/divisor
--if result is not a decimal then
--if result is not 1 or "dividend" then
print(dividend.."is not a prime number")
else
print(dividend.."is a prime number")
dividend= dividend + 1
divisor= 1
end
end
divisor= divisor + 1
end
while true do
divide()
wait()
end
In line 7, I don't know how to find if "result" has a decimal, as per the question says. In line 8, as soon as I type "not", it gets a red line under it.
Please note that I put the end and else just for convenience so please don't tell me that's the one incorrect.
1 answer
You can do this two different ways. Using the function modf() from math, we can devise two results from the number given: It's integral, and fractional component. If we retrieve a fractional component greater than zero, our number contains decimals. To use this directly in a conditional, we can use select() in conjunction with it to compare the second result.
local Pi = 3.14
if (select(2,math.modf(Pi)) > 0) then
print("Is a float!")
end
We can also use string patterns if you wish to match a dot character and a digit (which is a result of a decimal:
local Pi = 3.14
if (tostring(Pi):match("%p%d+") then
print("Is a float!")
end
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