//	Ex512.cc

//	Sec. 5.1 of lecture
//	Array: L_2 norm

#include <iostream.h>
#include <math.h>

main()
{
 const int N=10;
 double x[N], norm;
 int    i;
//                               Initialize x
 for (i = 0; i < N ; i++)
   {
     x[i] = sqrt(i+1.0);
   }
//                               L_2 norm calculation 
 norm = 0.0;
 for (i = 0; i < N; i++)
   {
     norm += x[i]*x[i];
   }
 norm = sqrt(norm);
 
 cout << endl;
 cout << "  L2-norm : " << norm << endl;
 cout << endl;
}