Question

How to reverse an array upto a given index in C#

Answer 1

using System;

class Program
{
    static void reverseUpToIndex(int[] arr, int index) {
        if (index > arr.Length) {
            Console.Write("Index out of range");
            return;
        }
     
        for (int i = 0; i < index / 2; i++) {
            int temp = arr[i];
            arr[i] = arr[index - i - 1];
            arr[index - i - 1] = temp;            
        }
    }
    static void Main() {
        int[] arr = { 1, 4, 8, 0, 7, 3, 9, 5, 6 };
        
        int index = 5;
        
        reverseUpToIndex(arr, index);
 
        Console.WriteLine(String.Join(" ", arr));
    }
}



 
 
/*
run:
 
7 0 8 4 1 3 9 5 6

*/
 

 

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