// NewDelete.cc  - shows how to use new and delete
#include <iostream>
using namespace std;

void show( double *a , int N ){
  for( int n=0; n<N; n++ )
    cout << "a["<<n<<"]=\t"
	 << a[n]
	 << endl ;
}

int main()
{
  double *a ;
  // This creates space for a pointer
  // but doesn't allocate any memory
  // for the array
  
  int    N = 20 ;

  a = new double[N] ; // allocates memory for
                      // a[0]..a[N-1]
  for( int n=0; n<N; n++ )
    a[n] = n*n ;
  show( a , N ) ; 
  delete [] a ;      // frees the memory
}