#include <stdio.h>

#define ARRAYSIZE(x)  (sizeof(x)/sizeof(*(x)))

void fum(int *array, size_t size)
{
   size_t i;
   /* Initialize array. */
   for ( i = 0; i < size; ++i )
   {
      array[i] = i;
   }
   /* Perform calculations. */
   for ( i = 0; i < size; ++i )
   {
      array[i] *= 2;
   }
   /* Print array. */
   for ( i = 0; i < size; ++i )
   {
      printf("%d,", array[i]);
   }
   putchar('\n');
}

int main(void)
{
   int myarray[25];
   fum(myarray, ARRAYSIZE(myarray));
   return 0;
}

/* my output
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,
*/