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C# negate the positive elements of an integer array

using System;  

public class Demo {  
   public static void Main(string[] args) {  
      int[] arr = { 10, 20, 15 };  
      Console.WriteLine("Displaying elements...");
      for (int i = 0; i < arr.Length; i++) {  
         Console.WriteLine(arr[i]);  
         if (arr[i] > 0)
         arr[i] = -arr[i];
      }  
   
      Console.WriteLine("Displaying negated elements...");  
      for (int i = 0; i < arr.Length; i++) {  
         Console.WriteLine(arr[i]);  
      }  
   }  
}  

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