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We initialized pointer p & q to NULL.
p++ -> 4
q++ -> 8

So the output is 0 0 4 8

this code is for cheking the memory size of int and double

it will print address stored in both pointers and next they will print address +4 for int pointer and address +8 for double pointer

the output will be 0 0 4 8

redroof is correct. (And note you cannot initiate a pointer with any other constant values except NULL or 0). Good question...

It is true that one can't instantiate the pointers to values but we can definitely assign values post declaration. One more thing when integer pointer is incremented it will point to a location that is 2 bytes away and not 4 bytes since the size of int is 2 bytes.

set value at location pointed by p and q to 0.
increments p and q to point to next int and double.
prints value at those locations.