一个糟糕的Erlang练习题

好吧，用的语法很糟糕。。。但是至少是做了练习。

题目

%The sequence of triangle numbers is generated by adding the natural numbers. So the 7th triangle number would be 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The first ten terms would be:

%1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...

%Let us list the factors of the first seven triangle numbers:

%

% 1: 1

% 3: 1,3

% 6: 1,2,3,6

%10: 1,2,5,10

%15: 1,3,5,15

%21: 1,3,7,21

%28: 1,2,4,7,14,28

%We can see that 28 is the first triangle number to have over five divisors.

%What is the value of the first triangle number to have over five hundred divisors?

好吧，我先写了个module，用来计算triangle num：

-module(triangle).

-export([triNum/1]).

triNum(0) -> 0;

triNum(N) ->

    N + triNum(N-1).

然后，我写了个module，来计算具体某个数有多少个triNum：

-module(divisor).

-export([num_of_divisor/2]).

num_of_divisor(_, 0) -> 0;

num_of_divisor(Num, Factor) when (Num rem Factor) =:= 0 ->

    2 + num_of_divisor(Num, Factor - 1);

num_of_divisor(Num, Factor) when (Num rem Factor) =/= 0 ->

    num_of_divisor(Num, Factor-1).

好吧，然后，我又用了第三个module：

-module(forRange).

-export([forRange/1]).

-import(triangle, [triNum/1]).

-import(divisor, [num_of_divisor/2]).

forRange(0) -> 0;

forRange(N) when N>0 ->

    TriNum = triNum(N),

    Res = num_of_divisor(TriNum, TriNum)/2,

    if

    Res >= 100 ->

        io:format("~f~n", [Res]),

        io:format("~b~n", [N]);

    true ->

        io:format("~n")

    end,

    forRange(N-1).

。。。

最后数找到了384，我还给自己找了个冠冕堂皇的接口，我还在熟悉语法。。。