Priority of operator

by

Upper operators are more preemptive than lower ones.

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left to right	[] () . -> rear++ rear--
right to left	front++ front-- sizeof & * +(positive) -(negitive) ~ !
right to left	(mandatory transform)
left to right	.* ->*
left to right	* / %
left to right	+ -
left to right	<< >>
left to right	< > <= >=
left to right	== !=
left to right	&
left to right	^
left to right	|
left to right	&&
left to right	||
right to left	?:
right to left	= *= /= %= += -= <<= >>= &= ^= |=
left to right	,

refer to:
https://blog.csdn.net/l2014010671/article/details/104636916