1char line[4] = { '1', '9', '9', '\0' };
2
3int main()
4{
5  char *ptr = line + 3;
6
7  while ((*--ptr += 1) > '9') *ptr = '0';
8  if (line[0] != '2' || line[1] != '0' || line[2] != '0')
9    abort();
10  return 0;
11}
12