#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

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

// call_with_int(…) is a function that takes as its first parameter, the
// address of a function that returns void and takes one parameter, an int.
void call_with_int( void(*fn)(int),  int n) {
   //               △         △
   //  returns void─┘         └─takes one parameter, an int

   fn(n);  // call the function at the address fn.
}

int main(int argc, char* argv[]) {
    //print_n(5);
    
    call_with_int( print_n, 5 );  // NOTE:  No parentheses after the name of function
    
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */