c++ variable declaration

Question

int a, b;
is it always the address of a < the address of b (&a < &b) or it depends on the compiler?

Answer 1

Martin Taylor

The memory addresses thats assigned to variable is not during compile time. its done by os.

seems like you are talking about relative addressing while i am saying about absolute addressing in virtual memory

have a look at this .

https://stackoverflow.com/questions/48969644/is-the-address-of-a-variable-in-c-the-real-address-in-the-ram-of-the-computer/48970674

Answer 2

thank you Martin Taylor for correcting me :) really well explained.

Initially i said that because i tested a piece of code simple one like this

int v;
printf("%d",&v);

compiling this thing on windows always gives a particular value . no matter when its ran . which means addresses are compiler generated .. but then i compiled same piece for linux , it always gave random values on each ram . so i thought that its decided by os . now i get it that the relative positioning of it wont change .

Thank you very much for clearing the ambiguity .

Answer 3

its not necessary for the declaration to have accupied successive blocks.
its more dependent of os rather than compiler to allocate memory .

and for arrays its guranteed that memory is contagious but thats not the case for variables .