map.c

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

int pow2(int val)
{
    return val * val;
}

int* map(int (*func)(int), int *arr, int len)
{   int *res = malloc(sizeof(int) * len);
    for (int i = 0; i < len; i++) {
        res[i] = func(arr[i]);    
    }
    return res;
}

int main(int argc, char **argv)
{
    int len = 10;
    int arr[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    int *powered2 = map(pow2, arr, len);
    for (int i = 0; i < len; i++) {
        printf("original: %d, powered: %d\n", arr[i], powered2[i]);
   } 
   return 0;
}