Math Operations with Function

local operation = {
    ["+"] = function(x,y) return x+y end,
    ["-"] = function(x,y) return x-y end,
    ["*"] = function(x,y) return x*y end,
    ["/"] = function(x,y) return x/y end
}

local function default()
    print("No opreation has been selected")
end

print("Choose your first number:")
local num1 = io.read()
print("Choose your second number:")
local num2 = io.read()
print("Choose your operation:")
local func = operation[io.read()] or default
print(func(num1,num2))