Convert string to integer in Elixir

Question

I have written a simple calculate for example but it isnot work

a = IO.gets"a = "
a = String.to_integer(a)
b = IO.gets"b = "
b = String.to_integer(b)
v = a + b
IO.puts "Sum: #{v}"

How can I correct this code?

Dogbert · Accepted Answer · 2017-06-28 12:18:33Z

4

IO.gets does not trim the trailing newline character which makes String.to_integer fail even if you enter only digits. You can remove it using String.trim_trailing/1:

a = IO.gets("a = ") |> String.trim_trailing
a = String.to_integer(a)
b = IO.gets("b = ") |> String.trim_trailing
b = String.to_integer(b)
v = a + b
IO.puts "Sum: #{v}"

$ elixir a.exs
a = 123
b = 456
Sum: 579

answered Jun 28, 2017 at 12:18

Dogbert

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1 Comment

Aleksei Matiushkin Over a year ago

a = "a = " |> IO.gets() |> String.trim_trailing() |> String.to_integer() looks more elixirish :)

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