ranDOM:uniform/0

返回一个随机浮点数

用法：

uniform() -> float()

内部实现：

%% uniform()
%%  Returns a random float between 0 and 1.

-spec uniform() -> float().

uniform() ->
    {A1, A2, A3} = case get(random_seed) of
		       undefined -> seed0();
		       Tuple -> Tuple
		   end,
    B1 = (A1*171) rem ?PRIME1,
    B2 = (A2*172) rem ?PRIME2,
    B3 = (A3*170) rem ?PRIME3,
    put(random_seed, {B1,B2,B3}),
    R = B1/?PRIME1 + B2/?PRIME2 + B3/?PRIME3,
    R - trunc(R).

返回一个 0 到 1 的随机浮点数

random:uniform().