Nios/pow2

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Write a function that will return whether its parameter is a power of 2. The parameter is an unsigned integer and will not be 0. 

int pow2(unsigned int num);

Expected solution length: Around 4 lines.

Sample Input

pow2(4)

Sample Output

r2=1

It is possible to do this without a loop. Consider the binary representations of (2n) and (2n-1).

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