java help

void print_money(int n) {
  if(n <= 99999) {
    printf("$%d.%d\n", n/100, n%100);
  } else if (n <= 99999999) {
    printf("$%d,%d.%d\n", n/100000, (n/100)%1000, n%100);
  } else {
    printf("$%d,%d,%d.%d\n", n/100000000, (n/100000)%1000, (n/100)%1000, n%100);
  }
}

bool is_prime_core(int k, int n) {
  if(k == 1) {
  	return true;
  } else if(0 == (n % k)) {
  	return false;
  } else {
  	return is_prime_core(k-1, n);
  }
}

bool is_prime(int n) {
  return is_prime_core(n - 1, n);
}

void help_print_primes(k, n) {
  if(k == n) {
    if(is_prime(n)) {
      printf(" %d.\n", n);
    } else {
      printf(".\n");
    }
  } else if (k == 2) {
      printf("%d", 2);
      help_print_primes(k+1, n);
  } else {
    if(is_prime(k)) {
      printf(" %d", k);
      help_print_primes(k+1, n);
    } else {
     help_print_primes(k+1, n);
    }
  }
}

void print_primes(int n) {
  help_print_primes(2, n);
}