pxia

8 ms·

1. 1.▲
   by pxia 7y ago

   When the gain is smaller than the cost of hiring people to do the claim.
2. 2.▲
   by pxia 8y ago

   It's just an example... Another example would be you want to iterate your array in reverse. The normal `for (uint i=size-1; i >= 0; i--)` won't work.
3. 3.▲
   by pxia 8y ago

   Because you want to represent errors. For example a find() function that returns the index of some element: you want to return -1 when the element doesn't exist.