IO.puts("Hello world!")
 
# Same as IO.puts but do not add a new line at the end
IO.write("Hello world !")

iex

h

name = IO.gets("Salut, comment tu t'appelles ? ")
 
IO.write("Salut " <> name)

number = IO.gets("Salut, entre un nombre : ") |> String.trim() |> String.to_integer()
 
for i <- 1..number do
  IO.puts("#{i}")
end

In elixir, values are not modified. Values are transformed on output.

Example :

name = "Toto"
 
if (name == "Toto") do
  IO.puts("Inside condition before name being changed: " <> name)
  name = "Robin"
  IO.puts("Inside condition after name being changed: " <> name)
end
 
IO.puts("Outside condition after name being changed: " <> name)

Output :

Inside condition before being changed: Toto
Inside condition after being changed: Robin
Outside condition after being changed: Toto

Example with date :

d1 = ~D[2023-04-25]
 
IO.puts(d1)
IO.puts(Date.add(d1, 5))
IO.puts(d1)

Output :

2023-04-25
2023-04-30
2023-04-25