50. Reverse an Array Using Only Pointers

#include <stdio.h>

void swap(int* a, int* b)
{
    int temp = *a;
    *a = *b;
    *b = temp;
}
void reverse_array(int *ptr, int n) {
    
    int *start = ptr;
    int *end = ptr + n - 1;

    while(start < end)
    {
        swap(start, end);
        start++;
        end--;
    }

}

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;
}