A brief introduction to the operation of various bit operators in C language

Operator :

arithmetic operators : +,-, *,/,%, + +,--

compliant operators : + =, *=,/=,%=

conditional operator :? :

relational operators : = =, >=, <=,! =, >, <

logical operators : &&, | | , !

assignment operator : =

Other operators : *, &,.

Bitwise operators :

1 > bitwise AND & at the same time for one or the other is zero 3 & 5 result is 1 ( two digits are first calculated in binary )

3 > 0000 0011

5 > 0000 0101 Binary then follow the same line for one or zero to 0000 0001

after conversion, it becomes 1;

generally used to clear 0 operation .

2 > Bitwise or | The same as 0 is 0 otherwise 1 9 | 5 9 > 00001001

|

5 > 00000101

=00001101 13

3 > bitwise XOR or difference is 1, the same is 0;

9 ^ 5 0000 1001

0000 0101

0000 1100 = 8 + 4 = 12;

4 > Bitwise Reverse ~ 1 to 0 0 to 1 for a single number

5 > shift left <<

High-level discard , low- fill 0

High Low

9 > 0000 0000 0000 1001

9 << 3 0000 0000 0100 + 8 = 9 * 2 3 - time equivalent

M << N is equivalent to the n- th square of M * 2.

6 > Right Shift >>

low Discard , high 0 ( positive ) or 1 ( negative )

the signed bit sign bit follows the move .

10

Original Code : The original code is itself binary 0000 1010

complement : ( all the numbers , stored in memory are in the form of a complement .)

1 > Positive : the complement of positive numbers is the same as the original code

2 > Negative numbers: the complement of negative numbers , the sign bit unchanged, the numerical part , and the inverse plus 1;

example : -10 of the Code

10000000 00000000 00000000 00001010

11111111 11111111 11111111 11110101

+1

11111111 11111111 11111111 11110110

Stored in accordance with the system (4 + 2)

FF FF FF F 6 (F6)

Some computers are stored in reverse.

F6 FF FF FF

Anti-code :

1 > Positive Inverse code is the same as the original code .

2 > negative Inverse code , sign bit unchanged, value part inverse

C Language Program edit the process of execution :

1 > Programmer's Coding area ;(Coding, the code );

2 > Pre- processing ( precompiled )

3 > compiled into assembly code

4 > assemble code into target file

5 > the target file and the attached library file link to form the executable file .

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

A brief introduction to the operation of various bit operators in C language