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 ,                       Expression evaluation

 e1 , e2                 Expression evaluation
 e1                      any expression
 e2                      any expression

    The comma , operator evaluates first the left operand e1, then the
    right operand e2, and then returns the value of e2.

   -------------------------------- Example ---------------------------------

           i = j=2 , j+3;
           /* i == 2, since assignment has a higher priority than , */

           i = (j=2 , j+3);
           /* i == 5; what's inside the parentheses is evaluated first */