Re: A interesting problem of C programming

"vaibhav khatavkar" <khatavkarvaibhav86@xxxxxxxxx> · Wed, 18 Jun 2008 16:24:31 +0530

Hi Wang Yu ,

             I saw ur code ... 

    char *p;                                                                                                                               

    p = 0;                                                                                                                                 
    printf("%s", p);                                                                                                                       

    printf("\n");                                                                                                                          

In ur first code snippet  "%s" prints string located at p .. and thats
null .. so we get output null ... (Note that : there are 2 printf
statements)

The out put is (null)

Now when u changed it like this ...  

But, if I change into:

#include
<stdio.h>                                                                                                                        

int
main()                                                                                                                                

{                                                                                                                                         

    char
*p;                                                                                                                              

    p =
0;                                                                                                                                

    printf("%s\n",
p);                                                                                                                      

    return
0;                                                                                                                             

}

The output will be Segment fault!

The segmentation fault comes just because in printf statement u have
written "%s\n" .. compiler is unable to resolve it ... when u add a
space between %s and \n the output is null and not segmentation fault
.. 

I don't know why....
Thanks!
-- 
National Research Center for Intelligent Computing Systems

Institute of Computing Technology, Chinese Academy of Sciences

-- 
with regards,
vaibhav