,                        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 */