$ cat test.c
#define NUM 42

int main () {
  int sum = 0;
  for (int i = 0; i < NUM; i++) {
    sum += i;
  }
  return sum;
}
$ cpp test.c | tail -7
int main () {
  int sum = 0;
  for (int i = 0; i < 42; i++) {
    sum += i;
  }
  return sum;
}
$ cpphs --cpp test.c | tail -7
int main () {
  int sum = 0;
  for (int i = 0; i < 42; i++) {
    sum += i;
  }
  return sum;
}