Reverse an Array Using Only Pointers

#include <stdio.h>

void swap(int *a,int *b){
   int temp;
   temp  = *a;
   *a = *b;
   *b = temp;
}
void reverse_array(int *ptr, int n) {
    int half = n/2;
    for(int i=0;i<half;i++){
        swap((ptr+i),(ptr-(n-1)));
    }

}

int main() {
    int n;
    scanf("%d", &n);

    int arr[100];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    reverse_array(arr, n);

    for (int i = 0; i < n; i++) {
        printf("%d", (*(arr+i)));
        if(i < n-1){
            printf(" ");
        }
    }

    return 0;
}