/* Sample c++ code to illustrate passing of functions as parameter  */
/* Otherwise, code is nonsense.                                     */

/* Illustrates technique needed for Simpson's Rule assignment,    */
/*     CS 350                                                     */
/*   v. 980921                                                    */

#include <iostream.h>

typedef float ( *pftn )( float );

float One ( float x )
{
	return( x );
	}

float Two( float x )
{
	return( 2*x );
	}

float Three( float x )
{
	return( 3*x );
	}

float PassFunctionParm( pftn ftn, float y )
{
	float value;
	value = ftn( y );
	return( value );
	}

void main( void )
{
	float x;

        /* Call functions directly to see their effect */
	  x = 1;
	  x = One( x );
          cout << "One x: " << x << endl;
          x = Two( x );
          cout << "Two x: " << x << endl;
          x = Three( x );
          cout << "Three x: " << x << endl;

        /* Now again, but pass function name as parameter */
          x = 1;
	  x = PassFunctionParm( One, x );
          cout << "Parm One x: " << x << endl;
          x = PassFunctionParm( Two, x );
          cout << "Parm Two x: "<< x << endl;
          x = PassFunctionParm( Three, x );
          cout << "Parm Three x: " << x << endl;
	}