Move all negative elements to end in swift

Swift program for Move all negative elements to end. Here more solutions.

import Foundation
// Swift 4 program for
// Move all negative elements at the end of array
class MyArray
{
	// Display array elements
	func display(_ arr: [Int], _ n: Int)
	{
		var i: Int = 0;
		while (i < n)
		{
			print(arr[i], terminator: "  ");
			i += 1;
		}
		print();
	}
	// Swap the given array elements
	func swap(_ arr: inout[Int], _ start: Int, _ end: Int)
	{
		let temp: Int = arr[start];
		arr[start] = arr[end];
		arr[end] = temp;
	}
	// Method which is move negative elements
	func moveNegative(_ arr: inout[Int], _ n: Int)
	{
		// first index
		var i: Int = 0;
		// last index
		var j: Int = n - 1;
		while (i < j)
		{
			if (arr[i] < 0 && arr[j] >= 0)
			{
				// When [i] index are have negative value 
				// And [j] is positive then swapping elements values
				self.swap(&arr, i, j);
				// Modified index
				i += 1;
				j -= 1;
			}
			else if (arr[i] >= 0)
			{
				// When element of [i] is not negative
				i += 1;
			}
			else
			{
				j -= 1;
			}
		}
	}
	static func main()
	{
		let task: MyArray = MyArray();
		// Array which are containing positive and negative values
		var arr: [Int] = [1, -1, 3, 2, -7, -5, 11, 6];
		let n: Int = arr.count;
		print("Before Arrange : ");
		// Before move element
		task.display(arr, n);
		// Move negative elements
		task.moveNegative(&arr, n);
		// After arrange
		print("After Arrange : ");
		// After move element
		task.display(arr, n);
	}
}
MyArray.main();

Output

Before Arrange :
1  -1  3  2  -7  -5  11  6
After Arrange :
1  6  3  2  11  -5  -7  -1



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