#include <stdint.h>
#include <stdio.h>

//#define BIG_SIZE 10000
#define BIG_SIZE 1000000000

//static const int BIG_SIZE = 10000;

struct big_s {
  uint8_t stuff[BIG_SIZE];
};

typedef struct big_s big;

void put(big b, uint8_t n) {
  for (int i  = 0; i < BIG_SIZE; ++i) {
    b.stuff[i] = n;
  }
}

void put_fast(big *b, uint8_t n) {
  for (int i  = 0; i < BIG_SIZE; ++i) {
    b->stuff[i] = n;
  }
}

int sum(big b, int i) {
  if (i >= BIG_SIZE) {
    return 0;
  }
  return b.stuff[i] + sum(b, i+1);
}

int sum_fast(big *b_ptr, int i) {
  if (i >= BIG_SIZE) {
    return 0;
  }
  return b_ptr->stuff[i] + sum_fast(b_ptr, i+1);
}

int main(int argc, char **argv) {
  big b;

  printf("Survived.\n");
  b.stuff[0] = 255;
  b.stuff[BIG_SIZE/2] = 255;
  b.stuff[BIG_SIZE-1] = 255;
  printf(
    "Stuff: %d, %d, %d\n",
    b.stuff[0],
    b.stuff[BIG_SIZE/2],
    b.stuff[BIG_SIZE-1]
  );
  put(b, 47);
  printf(
    "Stuff: %d, %d, %d\n",
    b.stuff[0],
    b.stuff[BIG_SIZE/2],
    b.stuff[BIG_SIZE-1]
  );
  put_fast(&b, 128);
  printf(
    "Stuff: %d, %d, %d\n",
    b.stuff[0],
    b.stuff[BIG_SIZE/2],
    b.stuff[BIG_SIZE-1]
  );

  printf("Fast sum: %d\n", sum_fast(&b, 0));
  printf("Slow sum: %d\n", sum(b, 0));
}