Using Pointers Sort Array

#include <stdio.h>
void main()
{
   int *ptr,a[100],i,j,temp,n;
   printf("\n\n Using C Pointers : Sort an array using pointer :\n"); 
   printf("----------------------------------------------------\n");	   
   
   printf(" Enter the size of array : ");
   scanf("%d",&n);
   ptr = a;
   printf(" Enter %d number of elements in the array : \n",n);
   for(i=0;i<n;i++)
      {
	  printf(" Enter Element No: %d : ",i+1);
	  scanf("%d",ptr+i);
      }  
	   
   for(i=0;i<n;i++)
   {
    for(j=i+1;j<n;j++)
    {
       if( *(ptr+i) > *(ptr+j))
       {
      temp = *(ptr+i);
      *(ptr+i) = *(ptr+j);
      *(ptr+j) = temp;
       }
    }
   }
   printf("\n The numbers in the array after sorting are: \n");
   for(i=0;i<n;i++)
      {
	  printf("  %d \n",*(ptr+i));
      }         
printf("\n");
}