Function pointer in argument in C - c

Question

I have to do an exercise where I have a certain numbers of functions and every function do a different thing like sort all the negative numbers from the array.
Moreover I have to create a function display with 3 argument pointers to an array, size of it and a name of a function which receives int and that the issue is int (Function pointer). I try to do this but this don't work and I don't know what to do in order to do correctly this exercise with a function pointer, because I don't understand that.
This is my code
int main (int argc, char **argv)
{
srand (time (NULL));
int arr[MAX_SIZE], second_arr[MAX_SIZE], i;
random_arr (arr);
display (arr, 20, negative_number (arr, second_arr));
system ("PAUSE");
return 0;
}
void random_arr (int *my_arr)
{
int i;
for (i = 0; i < MAX_SIZE; i++) {
*(my_arr + i) = i - 10;
}
}
int negative_number (int *arr, int *sort_arr)
{
int i;
for (i = 0; i < 20; i++) {
if (arr[i] < 0) {
sort_arr[i] = arr[i];
}
}
return sort_arr;
}
void diplay (int *arr, int size, int (*a_function) (int, int))
{
int i = 0;
for (i = 0; i < size; i++) {
printf ("%d\n", a_function);
}
}

Answer 1

It might be different from your intentions because your intentions is not clear.
but I think this would be helpful
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_SIZE 20
void random_arr (int size, int *my_arr);
int negative_number (int size, int *arr, int *sort_arr);
void display (int *arr, int size, int (*filter_function) (int in_size, int *in_array, int *out_array));
int main (void){
int arr[MAX_SIZE], second_arr[MAX_SIZE], i;
srand(time(NULL));
random_arr(MAX_SIZE, arr);
for(i = 0; i < MAX_SIZE; ++i)
printf("%d ", arr[i]);
puts("");
display (arr, MAX_SIZE, negative_number);
system ("PAUSE");
return 0;
}
void random_arr (int size, int *my_arr){
int i;
for (i = 0; i < size; i++) {
my_arr[i] = rand()%MAX_SIZE - MAX_SIZE/2;
}
}
int negative_number (int size, int *arr, int *sort_arr){
int i, j = 0;
for (i = 0; i < size; i++) {
if (arr[i] < 0) {
sort_arr[j++] = arr[i];
}
}
return j;//new array size
}
void display (int *arr, int size, int (*filter)(int in_size, int *in_array, int *out_array)){
int i = 0;
int *out = malloc(size * sizeof(*out));
int out_size = filter(size, arr, out);
for (i = 0; i < out_size; i++) {
printf ("%d\n", out[i]);
}
free(out);
}