Erlang Programming Examples

Program to update record values using Erlang

erlang

-module(helloworld).  
-export([start/0]).  
-record(student, {sname = "", sid}).   

start() ->  
   S = #student{sname = "Sachin",sid = 5},  
   S1 = S#student{sname = "Jonny"},  
   io:fwrite("~p~n",[S1#student.sid]),  
   io:fwrite("~p~n",[S1#student.sname]).

Program to access record values using Erlang

erlang

-module(helloworld).  
-export([start/0]).  
-record(student, {sname = "", sid}).   

start() ->  
   S = #student{sname = "Sachin",sid = 5},  
   io:fwrite("~p~n",[S#student.sid]),  
   io:fwrite("~p~n",[S#student.sname]).

Check whether an inserted value is a Tuple or not

erlang

-module(helloworld).  
-export([start/0]).  

start() ->  
   K = {abc,50,pqr,60,{xyz,75}} , io:fwrite("~w",[is_tuple(K)]).

Converting a Tuple to a List

erlang

-module(helloworld).
-export([start/0]).
start() ->
io:fwrite("~w",[tuple_to_list({1,2,3,4,5})]).

Check tuple size

erlang

-module(helloworld).  
-export([start/0]).  

start() ->  
   K = {abc,50,pqr,60,{xyz,75}} ,  
   io:fwrite("~w",[tuple_size(K)]).

Program to define a tuple in Erlang

erlang

-module(helloworld).  
-export([start/0]).   

start() -> 
   P = {1,2,3,{4,5}} ,  
   io:fwrite("~w",[P]).

Program to Create a List of Numbers in Erlang

erlang

-module(helloworld).  
-export([start/0]).   

start() ->  
   Lst = [1,2,3,4,5],  
   io:fwrite("~w~n",[Lst]).

String Operations in Erlang

erlang

-module(helloworld).  
-import(string,[concat/2]).  
-export([start/0]).  
   start() ->  
   S1 = "Today is ",  
   S2 = "Monday",  
   S3 = concat(S1,S2),  
   io:fwrite("~p~n",[S3]).

String in Erlang

erlang

-module(helloworld).  
-export([start/0]).   
start() -> 
   Str = "Today is: Holiday",  
   io:fwrite("~p~n",[Str]).

List

erlang

-module(helloworld).  
-export([start/0]).  

start() ->  
   List1 = [10,15,20,25,30] ,  
   io:fwrite("~w",[length(List1)]).

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