/*

 * Copyright 2011 Steven Gribble

 *

 *  This file is the solution to an exercise problem posed during

 *  one of the UW CSE 333 lectures (333exercises).

 *

 *  333exercises is free software: you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation, either version 3 of the License, or

 *  (at your option) any later version.

 *

 *  333exercises is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with 333exercises.  If not, see <http://www.gnu.org/licenses/>.

 */



// Lecture 3 exercise 4:

//

// Write a function that:

//  - accepts a function pointer and an integer as an argument

//  - invokes the pointed-to function, with the integer as its argument



#include <stdio.h>     // needed for the definition of NULL, printf

#include <assert.h>    // needed for the definition of assert()

#include <stdlib.h>    // EXIT_SUCCESS



// The C syntax for function pointers is pretty confusing.

// Read the manual (CARM); I've also found this web page

// to be pretty helpful:

//

//   http://www.newty.de/fpt/index.html

//

void InvokeFunction(void (*f)(int), int arg) {

  assert(f != NULL);

  f(arg);

}





// Here's some code to test our function

void FirstFunction(int a) {

  printf("In FirstFunction with argument '%d'\n", a);

}



void SecondFunction(int b) {

  printf("In SecondFunction with argument '%d'\n", b);

}



void ThirdFunction(int c) {

  printf("In ThirdFunction with argument '%d'\n", c);

}



int main(int argc, char **argv) {

  void (*g)(int);



  InvokeFunction(&FirstFunction, 5);

  InvokeFunction(&SecondFunction, 6);



  g = &ThirdFunction;

  InvokeFunction(g, 7);

  return EXIT_SUCCESS;

}