Paul Edwards wrote at Frank Adam:



FA>Paul, i am shocked ! Pointers can't be multiplied !?



PE>I wasn't actually aware that they couldn't be multiplied.



There's no reason for multiplying pointers, since they're just memory

addresses.



PE>I am used to pointers being integers, and knowing how C likes to

PE>let you do anything, I would have thought you could do something

PE>like that!



You'd have to cast to integers I guess, with something like:



p3=(void*)((int)p1*(int)p2);



PE>Come to think of it, I think I remember something about pointers

PE>not being allowed to be divided either.  But there is certainly

PE>a reason to want to do that.



PE>E.g.



PE>char *start;

PE>char *end;

PE>char *middle;



PE>middle = (start + end) / 2;



This gives the error "invalid operands to binary +" with GCC; apparently

the addition is causing the error because adding pointers has no meaning.

The only arithmetic operation which can operate on two pointers with meaning

is subtraction because it gives the amount of memory between the pointers.

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