首页 > 其他 > 详细

Unintended sign extension

时间:2017-04-15 15:45:52      阅读:411      评论:0      收藏:0      [点我收藏+]

 

 

符号扩展包括:

  1. Integral promotion

    charshort, enumerated type, or bit-field, whether signed or unsigned, can be used in any expression that calls for an int. If an int can hold all possible values of the original type, the value is converted to an int. Otherwise, it is converted to an unsigned int.

  2. Conversion between signed and unsigned integers

    When a negative signed integer is promoted to an unsigned integer of the same or larger type, it is first promoted to the signed equivalent of the larger type, then converted to the unsigned value.

 

修复方法:强转

To fix unintended sign extension problems, you must use explicit casting to achieve the intended results.

 

关于“无意的符号扩展”,这里有篇文章讲的很详细

http://docs.oracle.com/cd/E19253-01/816-5138/convert-2/index.html

 

Unintended sign extension

原文:http://www.cnblogs.com/liuzc/p/6714256.html

(0)
(0)
   
举报
评论 一句话评论(0
关于我们 - 联系我们 - 留言反馈 - 联系我们:wmxa8@hotmail.com
© 2014 bubuko.com 版权所有
打开技术之扣,分享程序人生!