Explanation: In the above program, the classA is declared with one member variable (c) and
one constant member function add(). The add() function is invoked with two integers. The
constant member function cannot perform any operation. Hence, the expression c=a+b will gen-
erate an error. The expression a+b is valid and cannot alter any value. The result obtained from
the equation a+b is displayed using CPU register.
8.23
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