50. Reverse an Array Using Only Pointers

#include <stdio.h>

void swap(int *x, int *y){
    *x = *x + *y;
    *y = *x - *y; 
    *x = *x - *y;
}

void reverse_array(int *ptr, int n) {
    // Your logic here
    volatile int i =0, j = n-1;

    while(i<j){
        swap(ptr+i, ptr+j);
        i++; j--;
    }
}

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;
}