Given an integer , return true if it is a power of two, otherwise false.
A power of two has exactly one set bit in binary: are 1, 10, 100, 1000, 10000, ... in binary.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Given an integer , return true if it is a power of two, otherwise false.
A power of two has exactly one set bit in binary: are 1, 10, 100, 1000, 10000, ... in binary.