Write a “C” function that modifies each element of a user supplied array by applying a user-provided function to each element of an array of integers. The user-provided function can also accept parameters. Please provide a typedef for the user-provided function.

pointer_on_function.c

#include <stdio.h>

typedef void (*func_handler)(int *p_arr_item); //typedef for user defined function

void func_for_processing_array(int arr[], size_t arr_size, func_handler h);
void do_something_with_item(int *p_item);

int main(int argc, char **argv)
{
    int test_arr[] = {23, 32, 43, 54, 2, 86, 90};
    int i = 0;
    printf("Before processing:\n");
    for (; i < sizeof(test_arr)/sizeof(test_arr[0]); i++)
    {
        printf("%d ", test_arr[i]);
    }
    printf("\n");

    func_for_processing_array(test_arr, sizeof(test_arr)/sizeof(test_arr[0]), do_something_with_item);

    printf("After processing:\n");
    i = 0;
    for (; i < sizeof(test_arr)/sizeof(test_arr[0]); i++)
    {
        printf("%d ", test_arr[i]);
    }
    printf("\n");
    return 0;
}

void func_for_processing_array(int arr[], size_t arr_size, func_handler h)
{
    size_t i = 0;
    for(; i < arr_size; i++)
    {
        h(&arr[i]);
    }
}

void do_something_with_item(int *p_item) //user defined function
{
    *p_item = *p_item*2;
}