#include <iostream.h>


/* -------------------------------------------------------------
   Definition of SumSquare

   The parameter "f" is a function; to convey this to
   the C++ compiler, we use a syntax that is similar to
   a function declaration  ( float f(float) )
   ------------------------------------------------------------- */
float SumSquare(float f(float), float a, float b)
{
   return( f(a) + f(b) );
}




int main(int param1, char *param2)
{

   float x, sum;
   extern float Square(float);      // (1) Declare Square before its use

   x = Square(5);		    // (2a) Now you can use Square

   sum = SumSquare(Square, 3, 4);   // (2b) You are using Square again
				    //      (as a parameter to a function)
				    // NOTE: you are using "SumSquare" here
				    //       also. It is OK, because it
				    //       has been DEFINED previously


   cout << " 3^2 + 4^2 = " << sum << "\n";
}