suggest parentheses around comparison in operand of &|

warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]

该警告希望你在&(逻辑与)表达式左右加上括号。有的时候&&(逻辑且)少写了一个&，也会产生该警告。

例如：   if((a[2]>>1)&0x1 == 1){ 

             .........

          }
应该将 (a[2]>>1)&0x1 用（）号括起来。因为&运算符的优先级较低，低于==和！=运算符。