function sqroot(n)
    if n > 0 then
        return math.sqrt(n)
    else 
        return "cant compute"
    end
end
function pi()
    return 3.141592653589793238462643
end
function power(x, y)
    if x > 0 and y > 0 then
        return math.pow(x, y)
    else
        return "cant compute"
    end
end

function abs(n)
        if n >= 0 then 
            return n
        end
        if n <= 0 then
            return n - (n*2)
        end
    end

print(abs(-5))