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  1. using System;
  2. using System.Linq;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 	    string cardNumber = "1234567890123456";
  9.         var subStrings = Enumerable.Range(0, 4).Select(n => cardNumber.Substring(n * 4, 4));
  10.         var result = String.Join("-", subStrings);
  11.         Console.WriteLine(result);
  12. 	}
  13. }
Success #stdin #stdout 0.03s 24224KB
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stdin
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Standard input is empty
stdout
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1234-5678-9012-3456
https://ideone.com/Bzypot
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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