Please help with these questions

Hi everyone.. can someone please help me to answer these questions... i am new to C and trying to understand the technique.

1.
k so what if you are given a code segmant like this:

Code:

---

      {  int i, j;

        { int a, b, c;

            { int i;


            }

        }

        { int a, j, k;

            { int i, j, b;

            }

        }

        { int i, j;

        }
      }

---

Assuming that a integer occupies 4 bytes, what is the minimum number of bytes which could be used to accomodate all the integers declared in the above fragment.


2.
The Gnu C Compiler (gcc) allows labels as values as a language-extension:
http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

But the documentation says:

You may not use this mechanism to jump to code in a different function. If you do that, totally unpredictable things will happen.

please can someone discuss the possible reasons for this restriction... i never used gcc.


thanks everyone