Swap Alternate Boundary Pairs | C ++ implementation of the approach ; Utility function to print the contents of an array ; Function to update the array ; Initialize the pointers ; While there are elements to swap ; Update the pointers ; Print the updated array ; Driver code
#include <bits/stdc++.h> NEW_LINE using namespace std ; void printArr ( int arr [ ] , int n ) { for ( int i = 0 ; i < n ; i ++ ) cout << arr [ i ] << " ▁ " ; } void UpdateArr ( int arr [ ] , int n ) { int i = 0 , j = n - 1 ; while ( i < j ) { int temp = arr [ i ] ; arr [ i ] = arr [ j ] ; arr [ j ] = temp ; i += 2 ; j -= 2 ; } printArr ( arr , n ) ; } int main ( ) { int arr [ ] = { 1 , 2 , 3 , 4 , 5 , 6 } ; int n = sizeof ( arr ) / sizeof ( arr [ 0 ] ) ; UpdateArr ( arr , n ) ; return 0 ; }