hr.erl

% ...
read_array(0,D) -> [];
read_array(N,D) -> 
   {ok, [X]} = io:fread("", D),
   [X | read_array(N-1,D)].

read_2darray(0,M,D) -> [];
read_2darray(N,M,D) ->
   Q=read_array(M,D),
   [Q | read_2darray(N-1,M,D)].
   
% This produces compiler warnings because the empty array case doesn't use the M or D variables:
% solution.erl:10: Warning: variable 'D' is unused
% solution.erl:15: Warning: variable 'D' is unused
% solution.erl:15: Warning: variable 'M' is unused

read_array(0,_M) -> [];
read_array(N,D) -> 
   {ok, [X]} = io:fread("", D),
   [X | read_array(N-1,D)].

read_2darray(0,_M,_D) -> [];
read_2darray(N,M,D) ->
   Q=read_array(M,D),
   [Q | read_2darray(N-1,M,D)].

% This doesn't produce compiler warnings because the variables start with an underscore,
% but still denotes the "M" and the "N" for clarity.