#include "stdio.h"

inline int square ( int a ) { return a * a ; }
inline int cube ( int a ) { return a * a * a ; }
inline int fourthpower ( int a ) { return a * a * a * a ; }
inline int squarepluscube ( int a ) { return square ( a ) + cube ( a ) ; }
inline int squarepluscubeplusfourthpower ( int a ) { return squarepluscube ( a ) + fourthpower ( a ) ; }

int ( * functionpointers [ 5 ] ) ( int ) ;
/*
the above line declares an array called functionpointers that has three ( 3 ) elements which are all pointers ( * ) to functions which take a single integer as parameter ( int ) and return nothing ( void ) and do not modify the contents of the class in anyway ( const )
*/

void executefunction ( int functionnumber, int inputforfunction )
{
	printf ( "%d\n", ( * functionpointers [ functionnumber ] ) ( inputforfunction ) ) ;
	// this line calls the function which is pointed ( * ) to by the functionnumber-th element of the functionpointers array which is a member of the object pointed to by the current object pointer ( this ) and passes the function the value of the variable inputforfunction as a parameter
}

int main ( void )
{
	functionpointers [ 0 ] = & square ;
	functionpointers [ 1 ] = & cube ;
	functionpointers [ 2 ] = & fourthpower ;
	functionpointers [ 3 ] = & squarepluscube ;
	functionpointers [ 4 ] = & squarepluscubeplusfourthpower ;
	
	int count ;
	for ( count = 0; count < 5; count ++ )
		executefunction ( count, 2 ) ;
}