Assigning int value to an address

Question

I thought the following codes were correct but it is not working.

int x, *ra;     
&ra  = x;

and

int x, ra;
&ra = x         


        

Answer 1

Both of those causes, in the way you have them in your question, undefined behavior.

For the first, you don't initialize the pointer, meaning it points to a random location (or NULL if the variable is global).

For the second, you try to change the address the variable is located at, which (if it even would compile) is not allowed.