Bit operator: Left shift and Right shift (Signed or unsigned? )

时间：2014-07-16 12:59:21 阅读：238 评论：0 收藏：0 [点我收藏+]

标签：c++ c

No matter left shift or right shift, the result‘s sign should always be the same as its left operand.

By default, const numbers in C/C++ is signed.

-Wsign-compare

{

unsigned int j = 3;

int k = 5;

if (j == (1 << (j))); //warning: comparison between signed and unsigned integer expressions.

if (j == (((unsigned int)1) << (j)));

if (k == (1 << (k)));

if (k == (((unsigned int)1) << (k))); //warning: comparison between signed and unsigned integer expressions.

if (j == (j >> 1));

if (j == (k >> 1)); //warning: comparison between signed and unsigned integer expressions.

if (k == (k >> 1));

if (k == (j >> 1)); //warning: comparison between signed and unsigned integer expressions.

}

标签：c++ c

原文地址：http://blog.csdn.net/tt33415366/article/details/37872591

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