/*
    function_pointers.c
    Demonstrates the function pointer type in C.
 */
#include <stdlib.h>
#include <stdio.h>

void print_int (int i) {
	printf("%d\n", i);
}

//float print_int; // this can't be declared in the same scope as the function named print_int

void print_fancy( int i ) {
    printf( "The int is %d\n", i );
}

void process_int( void (*do_it)(int), int the_int_to_process ) {
    do_it(the_int_to_process);
    printf( "I have done it\n" );
}

int main() {

    // float print_int; // this will shadow the function.
	
	// declare a function pointer
	// variable's name is func.
	// the type is a function that returns void and takes an
	// int as input
	void (*func)(int);
	
	// initialize a function pointer
	func = print_int;
	
	// call a function pointer
	func(10);
	
	process_int( print_int, 20 );
	process_int( print_fancy, 20 );
	
	return 0;
}