Question

Code 1:

int main(){
   int a=1;
   int b=2;
   cout << "&a: "<<&a << endl;
}

Output 1:

&a: 0x22ff48

Code 2:

int main(){
   int a=1;
   int b=2;
   cout << "&a: "<<&a << endl;
   cout << "&b: "<<&b << endl;
}

Output 2:

&a: 0x22ff4c
&b: 0x22ff48

---

So My Question is why the address of the varibale a changed when I printed out the address of the varibale b ?

Answer 1

When you didn’t use b at all, the compiler probably removed it completely, so it didn’t occupy any space.

When you took the address of b, that forced the compiler to allocate space for it.