50. Reverse an Array Using Only Pointers

#include <stdio.h>

void swap(int *ptr1, int *ptr2);

void reverse_array(int *ptr, int n) {
    int left = 0;
    int right = n - 1;
    while(left < right){
        swap((ptr + left) , (ptr + right));
        left++;
        right--;
    }
}

void swap(int *ptr1, int *ptr2){
    int temp = *ptr1;
    *ptr1 = *ptr2;
    *ptr2 = temp;
}

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;
}