What are the differences between a pointer variable and a reference variable in C++?

问题：

I know references are syntactic sugar, so code is easier to read and write.我知道引用是语法糖，所以代码更容易阅读和编写。

But what is the difference between a pointer variable and a reference variable?但是指针变量和引用变量有什么区别呢？

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解决方案：

参考一： https://en.stackoom.com/question/Ex9参考二： https://stackoom.com/question/Ex9