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<<                       Bitwise Shift Left

 exp1 << exp2            Bitwise shift left
 exp1                    any integer value
 exp2                    any integer value; treated as unsigned

    The << operator returns exp1 shifted to the left by exp2 bits, with
    the vacated righthand bits filled with zeros.  For example:

           j = 0x0F71;
           i = j << 4;          /* i == 0xF710 */

       Note:    The << operator does not alter exp1.