c++ - the functionalities of two lines of code -

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When I was trying to learn from an existing program, I could not understand that trying the following two lines ?

for (i = 0; 0 == (x & amp; 1); ++ i) x >> gt; = 1; If (0 == (x- = y)) return

Any explanation will be appreciated. 

 for  (I = 0; 0 == (x & amp; 1); ++ i) x >> gt; = 1

sets the least important bit to 1 in an integer 

  if (0 == ( X- = y)) Return y & lt; & Lt; I; Removes  x  from   
  , and if the result is 0, returns  y  More important bits by  i  bits.

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