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lua

how to join two variables

In my Lua code I need to do an operation that allows me to join two variables (an integer and a float) but without using the Adds (+) operator. How can I get this result?

local A = 12
local B = 0.2
local C = A ???? B
C = 12.2
Solution

  • You can achieve this by removing the decimal point from B, then concatenating A and B using string.format(), and finally converting the resulting string into a number with tonumber():

    local A = 12
local B = 0.2
local C = tonumber(string.format("%d.%d", A, B*10))

print(C) --> 12.2

    EDIT: If you have an arbitrary number of digits after the decimal point, you can use this function remove it:

    function remove_decimal_point(n)
    while n % 1 ~= 0 do
        n = n * 10
    end
    return n
end

    Then,

    local A = 12
local B = 0.2
local C = tonumber(string.format("%d.%d", A, remove_decimal_point(B)))

print(C) --> 12.2