尾递归pow-Erlang

基本上,在尾部递归中,您需要另一个充当累加器的参数。

%% So the first step is to convert the pow function to the pow_tail function, and initialize the accumulator to the default value. 

pow(N, X) -> pow_tail(N, X, 1);

%% Defined the base case for the pow_tail, to return the accumulator

pow_tail(_, 0, ACC) -> ACC;

%% Write the pow_tail function and store the result in the accumulator

pow_tail(N, X, ACC) when X > 0 -> pow_tail(N, X-1, ACC * N);

希望这能给你一个办法。