D3_ReverseArray.cpp

// You are given an array of integers arr[]. Your task is to reverse the given array.

// Examples:

// Input: arr = [1, 4, 3, 2, 6, 5]
// Output: [5, 6, 2, 3, 4, 1]
// Explanation: The elements of the array are 1 4 3 2 6 5. After reversing the array, the first element goes to the last position, the second element goes to the second last position and so on. Hence, the answer is 5 6 2 3 4 1.
// Input: arr = [4, 5, 2]
// Output: [2, 5, 4]
// Explanation: The elements of the array are 4 5 2. The reversed array will be 2 5 4.
// Input: arr = [1]
// Output: [1]
// Explanation: The array has only single element, hence the reversed array is same as the original.

#include <iostream>
using namespace std;

void reverseArray(int arr[], int n) {
    int start = 0, end = n - 1;
    while (start < end) {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
int main() {
    int arr[] = {1, 4, 3, 2, 6, 5};
    int n = sizeof(arr) / sizeof(arr[0]);
    
    reverseArray(arr, n);
    for (int i = 0; i < n; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;
    return 0;
}