#include <iostream>

using namespace std;

struct S 
{
  int a; 
  double b; 
  char c[10];
};

void f (S x)
{
	x.a = 10;
}

void g (S z[10])
{
	//z[0].a = 10;
	//z->a = 10;

	//z[2].a = 10;
	//*(z+2).a = 10;
	//(z+2)->a = 10;
}

bool hasDuplicateBs (S z[], int n)
{

	for (int i = 0; i < n; i++)
	{
		for (int j = i+1; j < n; n++)
		{
			if (z[i].b == z[j].b)
				return true;
		}
	}

	return false;

}

int main ()
{
	S x[5], y[10];
	
	//....

	cout << hasDuplicateBs (x,5);
	cout << hasDuplicateBs (y,10);


	x[2].a = 0;

	//f (x[0]); cout << x[0].a << endl;
	g (x); cout << x[2].a << endl;
}