||                       Logical OR operator

 exp1 || exp2            Logical OR
 exp1, exp2              any integral expression

    The || operator performs a logical  OR on exp1 and exp2; the  resulting
    value  is  TRUE  if  either  exp1  or  exp2 or both are TRUE, and FALSE
    otherwise.  The  operator evaluates exp1  first; if exp1  is TRUE, then
    exp2 is  not evaluated,  since the  entire expression  is already TRUE.
    Example:

           if ( (i == j) || (myfunc(k) == 0) )
               ...              # if i == j, myfunc() isn't called