Answer to Question #229669 in C for swastica k g

Question

Given an array of integers, update every element with the product of previous and next elements with following exceptions. i.       First element is replaced by multiplication of first and second.ii.      Last element is replaced by multiplication of last and second last.

Answer 1

#include <stdio.h>
void modify(int arr[], int n)
{
    if (n <= 1)
      return;
    int prev = arr[0];
    arr[0] = arr[0] * arr[1];
    for (int i=1; i<n-1; i++)
    {
        int curr = arr[i];
        arr[i] = prev * arr[i+1];
        prev = curr;
    }
    arr[n-1] = prev * arr[n-1];
}
int main() {
    int arr[] = {2, 3, 4, 5, 6};
    int n = sizeof(arr)/sizeof(arr[0]);
    modify(arr, n);
    for (int i=0; i<n; i++)
      printf("%d ",arr[i]);
    return 0;
}