How to negate the positive elements of an integer array in C#?

The following is the array and its elements −

int[] arr = { 10, 20, 15 };

Set negative value to positive elements.

if (arr[i] > 0)
arr[i] = -arr[i];

Loop the above until the length of the array.

for (int i = 0; i < arr.Length; i++) {
   Console.WriteLine(arr[i]);
   if (arr[i] > 0)
   arr[i] = -arr[i];
}

Let us see the complete example.

Example

 Live Demo

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]);  
      }
   }
}

Output

Displaying elements...
10
20
15
Displaying negated elements...
-10
-20
-15