John Zoltak writes:

>Here is a compilable code snippet in HP C/iX. I always get the Warning
>604. I cannot think of a cast to eliminate it. According to the book;
>
>In an assignment expression, if both the left hand and right hand side
>expressions are pointers, then the right hand side expression must
>either be the same type as the left side expression, or a pointer to
>void.
>
>Correct the expression (possibly by inserting a cast).
>
>    3  0   short (*pASCII)(short word, short base, char *string);
>    4  0
>    5  0   void *load()
>    6  0   {
>...
>   10  1   }
>   11  0
>   12  0   void main()
>   13  0   {
>   14  1      pASCII = load();
>   15  1   }
>cc: "CTEST01.PUB.LIB", line 14: warning 604: Pointers are not
>assignment-compatible.

The book has the rule misstated. The LHS, not the RHS of the expression
can be a pointer to void. You can't assign a pointer to void to any other
kind of pointer without an explicit cast, but you can assign any pointer
type to a pointer to void. (Think about void * parameters, for example.)

-- Bruce


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