suggest parentheses around comparison in operand of &|

error discription:

.cpp:187:25: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]
         if (data_cur[j] == 255 & data_pre[j] == 255) temp.at<uchar>(i, j) = 255
                

why:

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。

因为&运算符的优先级较低，低于==和！=运算符。

if ( (data_cur[j] == 255) && (data_pre[j] == 255) ) temp.at<uchar>(i, j) = 255;

RE

1.cnblogs-here;

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