general computer science questions about memory

I have some questions that I have always wanted to know the answer to.

1. I want to know when I declare in a program ( for instance in C programming) :

[code]int a;[/code]

How does the CPU find and determine where to allocate space for variables?

2. If I print the variable out - I get some previous number. So I wonder if the CPU allocated space where another value was - that wasn't important in memory. Where did this other value come from?

3. When you boot up a computer, the first thing that executed is the boot strap code in the CPU solid state instructions set, THEN that starts up the resident OS. Which means that boot strap is in a isolated memory of the CPU, RIGHT??

If I am wrong anywhere above in my computer science theory- PLEASE correct me.


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