C Primer Plus (5th Edition)

Chapter 15

1. 1. 00000011

   2. 00001101

   3. 00111011

   4. 01110111

2. 1. 21, 025, 0x15

   2. 85, 0125, 0x55

   3. 76, 0114, 0x4C

   4. 157, 0235, 0x9D

3. 1. 252

   2. 2

   3. 7

   4. 7

   5. 5

   6. 3

   7. 28

4. 1. 255

   2. 1 (not false is true)

   4. 1 (true and true is true)

   5. 6

   6. 1 (true or true is true)

   7. 40

5. In binary, the mask is 1111111 . In decimal, it's 127 . In octal, it's 0177 . In hexadecimal, it's 0x7F .

6. Both bitvbal *= 2 and bitval « 1 double the current value of bitval , so they are equivalent. However, mask += bitval and mask = bitval have the same effect only if bitval and mask have no bits set to on in common. For example, 2 4 is 6 , but so is 3 6.

7. 1. struct tb_drives { unsigned int diskdrives : 2; unsigned int : 1; unsigned int cdromdrives : 2; unsigned int : 1; unsigned int harddrives : 2; };

   2. struct kb_drives { unsigned int harddrives : 2; unsigned int : 1; unsigned int cdromdrives : 2; unsigned int : 1; unsigned int diskdrives : 2; };