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This article introduces the knowledge of "what are the left and right values of C++ expressions". In the operation of practical cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The expression of C++

Left value and right value

Today, we continue to say yesterday, yesterday talked about the left and right values of the expression in C++, due to time constraints, it is not complete. Today we will continue to add.

The so-called left value in C++: it is actually an object that can be referenced, or simply understood as an object that can be changed. For example, our common variables, arrays, reference type data, dereferencing of iterators, pointers, and so on, are all left values. At this point, some friends may want to ask, since the amount that can be modified is the left value, is it modified by the const we mentioned earlier, or is it the left value?

Yes, this is quite special, this is called the left value that can not be modified, in fact, basically, the left value can be accessed through a pointer, even if its value cannot be changed, this essence cannot be changed.

So, the right value, we can understand it as a constant in a broad sense, such as a common constant, a function with a return value, and the return value is not a pointer, or a reference, a polynomial, and so on.

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