gistfile1.c

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

void map_array(int *array, int size, int (^block)(int value)) {
   for (int i = 0; i < size; i++)
      array[i] = block(array[i]);
}

int main(int argc, char **argv) {
   int array[] = {
      30, 60, 17, 120, 42, 25, 32, 47,
      93, 75, 88, 230, 1270, 300, 400,
      224, 440, 89, 330, 1, -100, 5052
   };

   int tab_size = sizeof(array) / sizeof(int);

   map_array(array, tab_size, ^(int val) {
     return val * 2;
   });

   for (int i = 0; i < tab_size; i++)
      printf("%d ", array[i]);
   printf("\n");

   return 0;
}