1. What's the functional difference between a while loop and a do-while loop? 2. what is the functional difference between "va-num++" and "val = ++num"? 3. If you define the counter variable of a for loop in the initialization expression, can you access that variable outside the loop? 4. What is an infinite loop, and what causes them? 5. What five steps must be taken when a file is used by a program