50. Reverse an Array Using Only Pointers

#include <stdio.h>
void swap(int *a, int *b) {
    *a ^= *b;
    *b ^= *a;
    *a ^= *b;
}
void reverse_array(int *ptr, int n) {
    int left = 0, right = n - 1;
    while(left < right) {
        *(ptr+left) ^= *(ptr+right);
        *(ptr+right) ^= *(ptr+left);
        *(ptr+left) ^= *(ptr+right);
        left++; right--;
    }
}

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;
}