The following are the video to see Hao Bin teachers and curricula, review, copy and paste from notes.
Some operators trivial knowledge:
1. incremented or decremented {}
Increment before ----- ++ i: Category
After the increment ----- i ++
Pre-increment and post-increment similarities and differences:
The same: so that eventually the value of i is increased by one
different:
Increment value before the whole expression is the value of i after adding a
Since increasing the overall value of the expression is the value of i before adding a
Why is there increment?
Code more refined
Increment faster
Learn a few questions to understand the increment
And increment after increment of difference 1. Before we try to block out programming
2. The increment expression is best not as part of a larger expression to use
Or to use i ++ or ++ i alone as a statement, not to him as part of a complete compound statement
2. The ternary operator
A?B;C
Equivalent to
if（A）
B；
else
C；
3. comma expression
format
（A,B,C,D）
Features:
Left to right
The final value of the expression is the value of the last item
4. Bitwise Operators
& - Bitwise AND
&& - logic and also called and
& && completely different meaning and
| - Bitwise or
|| - logical or
~ - Bitwise
~ I i is the variable bit inversion of all
^ - bitwise exclusive or
The same as zero, to a different
<< - Bitwise Left Shift
Left by n bits multiplied by 2 ^ n, is faster than performing multiplication
>> - Bitwise Right Shift
Left by n bits is divided by 2 ^ n, provided that the data can not be lost, according to positive or negative or zero padding in front of a digital
Significance bit operator
By bitwise operations on the data we can accurately to every