Node:Questions 18, Previous:Machine-level operators, Up:Advanced operators

---

Questions 18

1. Hidden operators can be used in return statements, for example,
   

   return (++x);
   

   Would there be any point in writing the following?
   

   return (x++);
   

2. What distinguishes a bit string from an ordinary variable? Can any variable be a bit string?
3. What is the difference between an inclusive OR operation and an exclusive OR operation?
4. Find out what the decimal values of the following operations are.
   1. 7 & 2
   2. 1 & 1
   3. 15 & 3
   4. 15 & 7
   5. 15 & 7 & 3

   Try to explain the results. (Hint: sketch out the numbers as bit strings.)

5. Find out what the decimal values of the following operations are.
   1. 1 | 2
   2. 1 | 2 | 3
6. Find out the decimal values of the following operations.
   1. 1 & (~1)
   2. 23 & (~23)
   3. 2012 & (~2012)
   (Hint: write a short program to work them out.)