- int al = a2 ? strlen(a2) : 0;
- int bl = b2 ? strlen(b2) : 0;
- int cl = c2 ? strlen(c2) : 0;
- int dl = d2 ? strlen(d2) : 0;
+ unsigned long al = a2 ? strlen(a2) : 0;
+ unsigned long bl = b2 ? strlen(b2) : 0;
+ unsigned long cl = c2 ? strlen(c2) : 0;
+ unsigned long dl = d2 ? strlen(d2) : 0;