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|                        Bitwise OR operator

 exp1 | exp2             Bitwise OR
 exp1, exp2              any integral expression

    The | operator performs a bit-by-bit OR operation on exp1 and exp2.
    (A bit of the result is true if either or both of the corresponding
    bits of exp1 or exp2 is true.)  Example:

           i = 0x0FF0;
           j = 0xFF00;
           k = i | k;           /* k == 0xFFF0 */