-module(helloworld). -export([start/0]). start() -> Aabs = abs(-3.14), io:fwrite("~p~n",[Aabs]).

-module(helloworld). -import(math,[log/1]). -export([start/0]). start() -> Alog = log(3.14), io:fwrite("~p~n",[Alog]).

-module(helloworld). -import(math,[exp/1]). -export([start/0]). start() -> Aexp = exp(3.14), io:fwrite("~p~n",[Aexp]).

-module(helloworld). -import(math,[atan/1]). -export([start/0]). start() -> Atan = atan(0.7071), io:fwrite("~p~n",[Atan]).

-module(helloworld). -import(math,[acos/1]). -export([start/0]). start() -> Acos = acos(0.7071), io:fwrite("~p~n",[Acos]).

-module(helloworld). -import(math,[asin/1]). -export([start/0]). start() -> Asin = asin(0.7071), io:fwrite("~p~n",[Asin]).

-module(helloworld). -import(math,[tan/1]). -export([start/0]). start() -> Tan = tan(45), io:fwrite("~p~n",[Tan]).

-module(helloworld). -import(math,[cos/1]). -export([start/0]). start() -> Cosin = cos(45), io:fwrite("~p~n",[Cosin]).

-module(helloworld). -import(math,[sin/1]). -export([start/0]). start() -> Sin = sin(45), io:fwrite("~p~n",[Sin]).

-module(helloworld). -export([start/0]). start() -> io:fwrite("~f~n",[1.1+1.2]), io:fwrite("~e~n",[1.1+1.2]).

% Erlang浮点数 -module(helloworld). -export([start/0]). start() -> io:fwrite("~w",[1.1+1.2]).

-module(helloworld). -import(lists,[last/1]). -export([start/0]). start() -> Lst1=[1,2,3,4], io:fwrite("~w~n",[last(Lst1)]).

-module(helloworld). -import(lists,[duplicate/2]). -export([start/0]). start() -> Lst1 = duplicate(5,1),

-module(helloworld). -import(lists,[droplast/1]). -export([start/0]). start() -> Lst1 = [1,2,3], Lst2 = droplast(Lst1),

-module(helloworld). -import(lists,[delete/2]). -export([start/0]). start() -> Lst1 = [1,2,3], Lst2 = delete(2,Lst1),

-module(helloworld). -import(lists,[append/2]). -export([start/0]). start() -> Lst1 = [1,2,3], Lst2 = append(Lst1,[4,5]),

-module(helloworld). -import(lists,[any/2]). -export([start/0]). start() -> Lst1 = [1,2,3], Predicate = fun(E) -> E rem 2 == 0 end,

-module(helloworld). -import(lists,[all/2]). -export([start/0]). start() -> Lst1 = [1,2,3], Predicate = fun(E) -> E rem 2 == 0 end,

-module(helloworld). -export([start/0]). start() -> Lst1 = [1,2,3], io:fwrite("~w~n",[Lst1]).

-module(helloworld). -import(string,[sub_string/3]). -export([start/0]). start() -> Str1 = "hello world",

-module(helloworld). -import(string,[to_upper/1]). -export([start/0]). start() -> Str1 = "hello world",

% Erlang to_lower转为小写函数 -module(helloworld). -import(string,[to_lower/1]). -export([start/0]).

-module(helloworld). -import(string,[right/3]). -export([start/0]). start() -> Str1 = "hello",

-module(helloworld). -import(string,[right/2]). -export([start/0]). start() -> Str1 = "hello World",

-module(helloworld). -import(string,[left/3]). -export([start/0]). start() -> Str1 = "hello",

-module(helloworld). -import(string,[left/2]). -export([start/0]). start() -> Str1 = "hello World",

-module(helloworld). -import(string,[substr/3]). -export([start/0]). start() -> Str1 = "hello World",

-module(helloworld). -import(string,[str/2]). -export([start/0]). start() -> Str1 = "hello World",

-module(helloworld). -import(string,[chr/2]). -export([start/0]). start() -> Str1 = "hello World",

-module(helloworld). -export([start/0]). start() -> io:fwrite("~p~n",[binary_to_atom(<<"Erlang">>, latin1)]).