How do you find out if a number is a power of 2?

怎样知道一个数字是不是2的乘方？

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When you specify a buffer size, the value must be a power of 2.

当指定一个缓冲区大小时，该值必须是2的幂。

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The partition_size variable must be equal to a power of 2 (for example: 1, 2, 4, 8).

partition_size变量必须等于2的幂(例如：1、2、4、8)。

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Both devices are tasked with sending location information to a smartphone app, but BluTracker adds GPS and a whole lot of power, offering a range of 2, 500 feet or more outdoors, or a few hundred feet if you end up with some walls in between you and the compact rechargeable device.

ENGADGET: BluTracker lets you locate your stuff within 2,500 feet, we go hands-on (video)

According to the government's figures on the impact of its current settlement, Wiltshire has seen a relatively modest reduction in its spending power of 2.27% while many more deprived areas have seen a fall of up to 8.8%.

BBC: North/South spending divide in social care

So, it's okay to burn two units of natural gas in Qatar to make one appear in Texas, or to put 5 BTUs of coal into a power plant and have only 2 BTUs of electricity come out the other end.

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