#include <iostream.h>
//------------------------------------------
void out(double x)
{	cout<<"x=" << x<<endl;
	return;
}
  //------------------------------------------
double trpl(double x)
{	cout<<"entering trpl  with x="<<x<<endl;
	return (3 * x);
}
  //------------------------------------------
double hlf(double x)
{	cout<<"entering hlf with x="<<x<<endl;
	return (0.5 * x);
}
void add1to(double& x)
{	cout<<"entering add1to with x="<<x<<endl;
	x = x + 1;
}
  //------------------------------------------
int main(void)
{	double y=7.2;
	add1to(y);
	add1to(y);
	out( hlf(trpl( y )) );
	add1to(y);
	out( y );
	return (0);
}