if(id[0] < 'I') *sum += 10 + id[0] - 'A';

  else if(id[0] > 'I' && id[0] < 'O') *sum += 10 + id[0] - 'A' - 1;

  else if(id[0] > 'O' && id[0] < 'W') *sum += 10 + id[0] - 'A' - 2;

  else if (id[0] > 'W' && id[0] < 'Z') *sum += 10 + id[0] - 'A' - 3;

  else if (id[0] == 'I') *sum += 34;

  else if (id[0] == 'W') *sum += 32;

  else if (id[0] == 'O') *sum += 35;

  else if (id[0] == 'Z') *sum += 33;

比硬爆好一點吧