C - Re: Help in c pointers

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Re: Help in c pointers

Keith Thompson

2006-02-28, 7:55 am

"manochavishal@gmail.com" <manochavishal@gmail.com> writes:
> int *p;
> *p = 4;

p is uninitialized. Attempting to dereference it invokes undefined
behavior.

> char * msg;
> *msg = 'c';

msg is uninitialized. Attempting to dereference it invokes undefined
behavior.

> printf("msg is %s",msg);
>
>
> when i try to pass a value 4 to place what integer pointer p points to
> it says seg fault
>
> but for the char pointer it works fine.

Both are possible consequences of undefined behavior.

--
Keith Thompson (The_Other_Keith) 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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