Computer Systems: Program... -Access
3rd Edition
ISBN: 9780134071923
Author: Bryant
Publisher: PEARSON
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Chapter 2.1, Problem 2.14PP
Program Plan Intro
Bit-level operations in C:
- One important characteristic of “C” is supporting bitwise Boolean operation.
- The symbols used in “C” is same as the Boolean operation such are “~”, “&”, “|” and “^”.
- Encode logical operations for “~”, “&”, “|” and “^” is “NOT”, “AND”, “OR”, and “EXCLUSIVE-OR” respectively.
- These can be applied to any “integral” data type.
Example:
The example for applying Boolean operation in integral data type is shown below:
| C Expression | Binary expression | Binary result | Hexadecimal result |
| ~0x32 | ~[0011 0010] | [1100 1101] | 0xCD |
| 0x32 & 0x46 | [0011 0010]& [0100 0110] | [0000 0010] | 0x02 |
| 0x12 | 0x26 |
[0001 0010]| [0010 0110] | [0011 0110] | 0x36 |
Table for “~” Boolean operation:
The “~” operation means change the bit “1” to “0” and change the bit “0” to “1”.
- It is also called as “NOT” operation.
| ~ | |
| 0 | 1 |
| 1 | 0 |
Table for “&”Boolean operation:
This Boolean operation is used to “AND” the value of two bits
| & | 0 | 1 |
| 0 | 0 | 0 |
| 1 | 0 | 1 |
Table for “|”Boolean operation:
This Boolean operation is used to “OR” the value of two bits vectors.
| | | 0 | 1 |
| 0 | 0 | 1 |
| 1 | 1 | 1 |
Table for “^”Boolean operation:
This Boolean operation is used to “EXCLUSIVE-OR” of two bits vectors.
| ^ | 0 | 1 |
| 0 | 0 | 1 |
| 1 | 1 | 0 |
Logical operations in C:
- Logical operations in “C” are “&&”, “||” and “!” which are correspond to the operations of Boolean such as “AND”, “OR”, and “NOT”.
- These operations return the result in either “True” or “False”.
- That is returns “0” or “1”.
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Chapter 2 Solutions
Computer Systems: Program... -Access
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