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void set_flag(int number, int *sign_flag) {
  if (sign_flag == NULLnullptr) {
    return;
  }
  if (number > 0) {
    *sign_flag = 1;
  }
  else if (number < 0) {
    *sign_flag = -1;
  }
}

void func(int number) {
  int sign;

  set_flag(number, &sign);
  /* use sign */
}

void set_flag(int number, int *sign_flag) {
  if (sign_flag == NULLnullptr) {
    return;
  }
  if (number >= 0) { /* account for number being 0 */
    *sign_flag = 1;
  } else {
    assert(number < 0);
    *sign_flag = -1;
  }
}

void func(int number) {
  int sign;

  set_flag(number, &sign);
  /* use sign */
}