Question

How to move all negative elements to the beginning of array in C#

Answer 1

using System;

public class Program
{
	 public static void move_negative_to_beginning(int[] arr, int size) {
		int beginning_index = 0;

		for (int i = 0; i < size; i++) {
			if (arr[i] < 0) {
				int tmp = arr[i];
				arr[i] = arr[beginning_index];
				arr[beginning_index] = tmp;

				beginning_index++;
			}
		}
	 }
	public static void Main(string[] args)
	{
		int[] arr = new int[] {-1, 8, -6, 21, -3, 4, -2, 7, 15, -30, -40, 9};

		int size = arr.Length;

		move_negative_to_beginning(arr, size);

		for (int i = 0; i < size; i++) {
			Console.Write(arr[i] + " ");
		}
	}
}






/*
run:
 
-1 -6 -3 -2 -30 -40 21 7 15 8 4 9 
     
*/

 

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