50. Reverse an Array Using Only Pointers

#include <stdio.h>

void reverse_array(int *ptr, int n) {

    int *arr_left_ptr = ptr;
    int *arr_right_ptr = ptr + n-1;

    while(arr_left_ptr < arr_right_ptr){
        int temp = *arr_left_ptr;
        *arr_left_ptr = *arr_right_ptr;
        *arr_right_ptr = temp;
        arr_left_ptr++;
        arr_right_ptr--;
    }
}

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;
}