Re: invalid operands to binary?
Re: invalid operands to binary?
- Subject: Re: invalid operands to binary?
- From: Shawn Erickson <email@hidden>
- Date: Fri, 14 May 2004 11:30:42 -0700
On May 14, 2004, at 10:29 AM, Shawn Erickson wrote:
On May 14, 2004, at 9:50 AM, email@hidden wrote:
why does this:
unsigned long long *total;
unsigned long long totalFileSizeK = total/1024;
give me this:
invalid operands to binary /
is there something easy i'm missing here?
In the above total is defined as a pointer to a ulonglong (the *) and
when you do "total/1024" you are attempting to divide the value of the
pointer (not the ulonglong). Surprised it is giving you this
error/warning [1] but... try "(*total)/1024" which dereferences total
to get at the ulonglong. Of course total needs to point at an
allocated ulonglong which in the above it doesn't appear to be.
I assume you are using a function that wants a pointer to a ulonglong
and that is why you have defined total as you have, so...
unsigned long long total, totalFileSizeK;
someFuntionThatWantsAPointerToTotal( &total );
totalFileSizeK = total / 1024;
& = pointer (reference) to variable, address of the variables storage
basically
* = deference a pointer, data from the memory addressed basically
-Shawn
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