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This article mainly introduces the C++ citation and const modifier how to use, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

1. Citation

A reference is an alias for a defined variable that can simply be understood as a nickname for the same variable. Since it is a nickname or alias, it obviously has the same effect as the original variable name. So we modify the alias, and the original variable value will also change.

We use the symbol & to indicate the reference.

For example, in the following example, we create a reference b of the a variable

Int a = 3 _ int & b = a _

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