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Cedric Beust posted a few tricky interview questions in FUN WITH BITS

There are three categories of bit-shifting questions that I usually pick from, in increasing order of difficulty:

1. How can you determine if a number is a power of two?
2. How can you clear the rightmost bit?
3. How can you count the number of 1 bits?

Answers were given in the blog. However they were derived at logically. In this day and age of the test-first hype, I would like to challenge its adherents to solve the problems in a test-first fashion.

Any takers?