rvalue and lvalue

In C++, the distinction is less simple. In C++, an lvalue expression yields an object or a function.However, some lvalue, such as const objects, may not be the left-hand operand of an assignment.Moreover,some expressions yield objects as an rvalue,we use
the object's value(its contents).When we use an object as an lvalue,we use the object's identity(its location in memory).