测试一个数是否是2的幂 [英] to test whether a number is a power of 2
问题描述
给出一个单行C表达式来测试一个数字是否是2的幂。
[不允许循环]
ravi写道:
给出一个单行C表达式来测试一个数字是否是2的幂。
[不允许循环]
做自己的作业。
Brian
ravi写道:
>
给出单行C表达式来测试一个数字是否是一个电源
of 2. [不允许循环]
对于无符号整数:
if(!((n - 1)& n))put(n ispower of 2);
-
< http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt>
< http://www.securityfocus.com/columnists/423>
< http://www.aaxnet.com/editor/edit043.html>
cbfalconer at ma ineline dot net
-
通过 http://www.teranews.com
ravi写道:
给出单行C表达式来测试一个数字是否为2的幂。
[不允许循环]
static inline int
is_power_of_2(int x)
{
return((x& (x - 1))== 0);
}
-
------------ -------------------------------------------------- ---
Erik de Castro Lopo
--------------------------- --------------------------------------
哈马斯:伊斯兰教将征服美国和英国。
- http://www.pmw.org.il/LatestBulletins.htm#b220606
Give a one-line C expression to test whether a number is a power of 2.
[No loops allowed]
ravi wrote:
Give a one-line C expression to test whether a number is a power of 2.
[No loops allowed]Do your own homework.
Brian
ravi wrote:>
Give a one-line C expression to test whether a number is a power
of 2. [No loops allowed]For unsigned integers:
if (!((n - 1) & n)) puts("n is power of 2");
--
<http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt>
<http://www.securityfocus.com/columnists/423>
<http://www.aaxnet.com/editor/edit043.html>
cbfalconer at maineline dot net
--
Posted via a free Usenet account from http://www.teranews.com
ravi wrote:
Give a one-line C expression to test whether a number is a power of 2.
[No loops allowed]static inline int
is_power_of_2 (int x)
{
return ((x & (x - 1)) == 0) ;
}
--
-----------------------------------------------------------------
Erik de Castro Lopo
-----------------------------------------------------------------
"Hamas: Islam will conquer US and Britain."
-- http://www.pmw.org.il/LatestBulletins.htm#b220606
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