|  | explicit cast to malloc() | | |
| | | mohi |  |
|  Posted: Fri Jul 25, 2008 7:46 pm Post subject: explicit cast to malloc() |  |
hello everyone ,
as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
pls help
thank you
mohan |
| |
| | | Eric Sosman | |
| | Posted: Fri Jul 25, 2008 7:46 pm Post subject: Re: explicit cast to malloc() | |
mohi wrote:
| Quote: | hello everyone ,
as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
|
You're compiling C++, not C. The comp.lang.c++ newsgroup
is just down the hall to your left; I hear they're planning to
have a party as soon as they find the template.
--
Eric.Sosman@sun.com |
| |
| | | Keith Thompson | |
| | Posted: Fri Jul 25, 2008 7:46 pm Post subject: Re: explicit cast to malloc() | |
| |  | |
mohi <mohangupta13@gmail.com> writes:
| Quote: | as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
|
Does it show an error *like* "invalid conversion from void* to node*",
or does it show that exact error?
I might expect to see an error message about converting from int to
node* if you forgot the mandatory "#include <stdio.h>".
If that doesn't help, read question 7.6 of the comp.lang.c FAQ,
<http://www.c-faq.com/>, and in the future please check the FAQ before
posting. If that doesn't help, read the rest of section 7, and
perhaps the entire FAQ. And if *that* doesn't help, feel free to post
again -- but *please* copy-and-paste your actual complete program and
the exact error message.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister" |
| |
| | | CBFalconer | |
| | Posted: Fri Jul 25, 2008 7:46 pm Post subject: Re: explicit cast to malloc() | |
mohi wrote:
| Quote: |
as i have noted a lot many times it has been mentioned that we
shudn't cast pointers returned by malloc(). i mean its been
said that use: node * nod=malloc(sizeof(node));
instead of: node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
|
You are using a C++ compiler, not a C compiler. Probably because
you have misnamed the source file, which should be of type .c
(lower case).
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home.att.net>
Try the download section. |
| |
| | | Eric Sosman | |
| | Posted: Fri Jul 25, 2008 7:46 pm Post subject: Re: explicit cast to malloc() | |
mohi wrote:
| Quote: | [...]
it becomes so confusing when u have to use both c and c++
is there a better way of dealing with this confusion
|
Sure:
(setq use-C nil
use-C++ nil
use-lisp exclusively
tongue-in-cheek t)
--
Eric.Sosman@sun.com |
| |
| | | Keith Thompson | |
| | Posted: Fri Jul 25, 2008 7:46 pm Post subject: Re: explicit cast to malloc() | |
David Resnick <lndresnick@gmail.com> writes:
| Quote: | On Jul 25, 4:10 pm, Keith Thompson <ks...@mib.org> wrote:
[...]
I might expect to see an error message about converting from int to
node* if you forgot the mandatory "#include <stdio.h>".
You mean <stdlib.h>...
|
Yes, thanks.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister" |
| |
| | | William Pursell | |
| | Posted: Fri Jul 25, 2008 7:57 pm Post subject: Re: explicit cast to malloc() | |
On 25 Jul, 20:46, mohi <mohangupt...@gmail.com> wrote:
| Quote: | as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
|
Most likely you are invoking gcc as a c++ compiler. |
| |
| | | David Resnick | |
| | Posted: Fri Jul 25, 2008 8:14 pm Post subject: Re: explicit cast to malloc() | |
On Jul 25, 4:10 pm, Keith Thompson <ks...@mib.org> wrote:
| Quote: | mohi <mohangupt...@gmail.com> writes:
as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
Does it show an error *like* "invalid conversion from void* to node*",
or does it show that exact error?
I might expect to see an error message about converting from int to
node* if you forgot the mandatory "#include <stdio.h>".
|
You mean <stdlib.h>...
-David |
| |
| | | mohi | |
| | Posted: Fri Jul 25, 2008 8:24 pm Post subject: Re: explicit cast to malloc() | |
On Jul 26, 1:14 am, David Resnick <lndresn...@gmail.com> wrote:
| Quote: | On Jul 25, 4:10 pm, Keith Thompson <ks...@mib.org> wrote:
mohi <mohangupt...@gmail.com> writes:
as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
whats the matter ?
Does it show an error *like* "invalid conversion from void* to node*",
or does it show that exact error?
I might expect to see an error message about converting from int to
node* if you forgot the mandatory "#include <stdio.h>".
You mean <stdlib.h>...
-David
|
sorry guys im really sorry
i did compile it with g++
it becomes so confusing when u have to use both c and c++
is there a better way of dealing with this confusion
mohan |
| |
| | | Greg Comeau | |
| | Posted: Fri Jul 25, 2008 10:26 pm Post subject: Re: explicit cast to malloc() | |
In article <84799233-4bea-453e-8f32-a97c1626a015@s21g2000prm.googlegroups.com>,
mohi <mohangupta13@gmail.com> wrote:
| Quote: | as i have noted a lot many times it has been mentioned that we shudn't
cast pointers returned by malloc()
i mean
its been said that use
node * nod=malloc(sizeof(node));
instead of
node * nod=(node *) malloc( sizeof(node));
but when i use the upper way my gcc compiler shows error like
invalid conversion from void* to node*
|
Does it literally say void *, or does it say int?
If it literally says void * you're probably compiling in C++
mode not in C mode. If it says int, then, you're probably
not #include'ing the right header for malloc, that is, stdlib.h
--
Greg Comeau / 4.3.10.1 with C++0xisms now in beta!
Comeau C/C++ ONLINE ==> LINK
World Class Compilers: Breathtaking C++, Amazing C99, Fabulous C90.
Comeau C/C++ with Dinkumware's Libraries... Have you tried it? |
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