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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		double ra = Convert.ToDouble(147);
  8.       double area = Math.PI * Math.Pow(ra,2);
  9.  
  10.     Console.WriteLine("Hello World"+$"圓面積={Math.Round(area,4):N4}");
  11. 	}
  12. }
Success #stdin #stdout 0.02s 16600KB
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Standard input is empty
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Hello World圓面積=67,886.6757
https://ideone.com/DmDDdP
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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