Invertovanje dinamickog niza

#include <stdio.h>
#include <stdlib.h>
#define N 100

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

void main()
{
    while(1)
        {
            int b;
            int *p, *q;

            printf("Unesite duzinu niza n: "); int n; scanf("%d",&n);
            if (n<=0 || n>N) break;

            printf("Unesite elemente niza: "); int a[N];
            for(p=a;p<a+n;scanf("%d", p++));

            for(p=a, q=a+n-1; p<q; p++,q--)
            {
                b=*p; *p=*q; *q=b;
            }

            printf("\n\nRezultujuci niz izgleda ovako:  "); for(p=a;p<a+n;printf(" %d",*p++));
            printf("\n\n");
        }
}