tune more wrote: > Thanks Joe, so in first one, value is constant but > address still can be changed. In second, both value > and address can not be changed. Read it again. In the second case, the value pointed to *can* be changed, but the pointer itself cannot. > (chaning addresses > might not make sense, Sure it does. You often want to change the value of a pointer (an address) to point at a different memory location. That's pretty much the whole reason to have pointer variables and address arithmetic. Cheers, -- Joe > but technically it still can be > changed.) Right? > > --- Joseph A Knapka <jknapka@earthlink.net> wrote: > >>Joseph A Knapka wrote: >> >>>tune more wrote: >>> >>> >>>>Hi, >>>> >>>>Here is an example of "const modifier" usage: >>>> int execv(const char *path, char *const >>> >>argv[]); >> >>>>Is there any different between const before char >>> >>* and >> >>>>const after char *. >>>> >>> >>>const char* pc1; /* A pointer to constant >> >>characters: *pc1 = 'a' >> >>> will fail to compile, but >> >>pc1="a" is OK. */ >> >>>char * pc2 const; /* A constant pointer to >> >>non-const character. >> >>> *pc2='a' is OK, but pc2="a" >> >>will fail >> >>> to compile. */ >> >>Sorry, that second decl should be >> >>char * const pc2; /* A const * to non-const char */ >> >> >>>You need to find a copy of a recent edition of K&R >> >>(that >> >>>is, Kernighan & Ritchie, "The C Programming >> >>Language"). >> >>...and apparently I need to re-read mine... >> >>Cheers, >> >>-- Joe >> >> >> > > > __________________________________________________ > Do you Yahoo!? > Y! Web Hosting - Let the expert host your web site > http://webhosting.yahoo.com/ > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
