operand of postfix operator->

[Rajesh S R]

Consider the following code
int main()
{
struct name
{
long a;
int b;
long c;
}s={3,4,5},*p;
p=&s;

printf("%d",*(int *)((char *)p+(unsigned int)&(((struct name*)0)-

b)));

}



(unsigned int)&(((struct name*)0)->b)

Is the above expression valid according to C99?
That is, Can we have a null pointer as an operand of postfix operator-

?

Thanks in advance for the reply.

 

[Chris Dollin]

Consider the following code

(fx:snip horrid code)

You asked that already, and got two answers. What's the rush?