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filescalainputioextract
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Reputation: 3

extract formatted input from file in scala

I'm working on a program that read a file, and from this file, I need to get the numbers in a specific order.

All the numbers are on the same line, and separated by a tabulation. Like in this example :

d       s       a       m
2       1       0       1
3       2       1       1

In C++, that should look like that :

unsigned d, s, a;
infile >> d >> s >> a;

But I'm new in Scala, so I have no idea how to do.

I'm using scala.io.Source.

Upvotes: 0

Views: 282

Answers (1)

Rex Kerr
Rex Kerr

Reputation: 167901

If you have a string str containing whitespace-separated numbers (which you can get with getLines()), you can

val nums = str.
  split("\\s+").    // Splits at whitespace into an array of strings
  map(_.toInt)      // Converts all elements of array from String to Int

and then if you want to pull the first three out you can

val Array(d,s,a) = nums.take(3)

or

val (d,s,a) = (nums(0), nums(1), nums(2))

or various other things.

Upvotes: 2

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