Can your C compiler do this:


int main()
{
  int *p;
  p  = 0;
  *p = 0;
  return 0;
}

?

>>1
Yes, it generates the reasonable code(on x86):

C705 00000000 00000000    MOV DWORD PTR DS:[0],0
33C0                      XOR EAX,EAX
C3                        RETN
>>3
If it's true, it's a stupid requirement. On most architectures there can be something on address 0.