I am trying to write the following code using pointers inste

I am trying to write the following code using pointers instead of indexing (in C++). The following code is correct:

void shift(int arr[], int n) {
           int temp = arr[n - 1];
               int temp1;

           for (int i = 0; i < n; i++) {
               temp1 = arr[i];
arr[i] = temp;
               temp = temp1;
              
}
       }

This is my ATTEMPT at writing it with pointers but I know it is wrong. Can someone help fix it?

void shift(int arr[], int n) {

int temp = arr + (n - 1);
       int temp1;

  
       for (int *ptr = arr; ptr < arr + n; ++ptr) {
           temp1 = *ptr;
           *ptr = temp;
           temp = temp1;

}

}

Solution

void shift(int *a, int n){

int temp= *(a+n-1);

int temp1;

for(int i=0;i<=n;i++){

temp1=*(a+i);

*(a+i)=temp;

temp=temp1;

}

}