Does anybody know if it is allowed to compare pointer using the
operators '<', '<=', '>' or '>='?
operators '<', '<=', '>' or '>='?
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Re: Comparing Pointer
sebastien.frick er@gmail.com wrote:
Yes, but with limitations. You're allowed to compare any two valid orDoes anybody know if it is allowed to compare pointer using the
operators '<', '<=', '>' or '>='?
null pointers of compatible types[1] using == and !=. Using <, >, <= andthe same object (array, struct, union, etc.). If not, the behaviour is>=, though, there is the additional demand that they must point within
undefined. That also means that you can't compare to a null pointer
(constant) using < or >.
Richard
[1] Or pointers to void, or pointers to qualified versions of compatible
types, or null pointer constants.
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Re: Comparing Pointer
sebastien.frick er@gmail.com writes:If your textbook doesn't answer that question, get a better one. IDoes anybody know if it is allowed to compare pointer using the
operators '<', '<=', '>' or '>='?
recommend K&R2 (Kernighan & Ritchie, _The C Programming Language_, 2nd
Edition).
--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
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Re: Comparing Pointer
In article <ln3b9oowod.fsf @nuthaus.mib.or g>,
Keith Thompson <kst-u@mib.orgwrote:In some prints of the book, the section on pointer comparisons>sebastien.fric ker@gmail.com writes:>>Does anybody know if it is allowed to compare pointer using the
>operators '<', '<=', '>' or '>='?
>If your textbook doesn't answer that question, get a better one. I
>recommend K&R2 (Kernighan & Ritchie, _The C Programming Language_, 2nd
>Edition).
(A7.10) has an omission that is corrected in the errata, see
http://cm.bell-labs.com/cm/cs/cbook/2ediffs.html .
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