Printf the current address in C program

Question

Imagine I have the following simple C program:

int main() {

int a=5, b= 6, c;
c = a +b; 
return 0;
}

Now, I would like to know the address of

Answer 1

In gcc, you can take the address of a label using the && operator. So you could do this:

int main() 
{
    int a=5, b= 6, c;

    sum:
        c = a+b;

    printf("Address of sum label in memory: %p", &&sum);
    return 0;
}

The result of &&sum is the target of the jump instruction that would be emitted if you did a goto sum. So, while it's true that there's no one-to-one address-to-line mapping in C/C++, you can still say "get me a pointer to this code."